As to the
OP and for VanHallan's question, in 6th ed, Terminator armor is king. Anything you can pack that can effectively kill terminators can also kill everything else in the game. When you go up from that point, to say Heavy Bolters, which has a lot of shots, but is
Str 5 and
AP 5, you are then hoping to force your opponent to fail on armor saves. While this can be a legit tactic, armor saves are normally the unit's best save (Power armor is a 3+ armor save, for example). You are, in fact, adding a extra step that might save their guys that plasma, melta, and Lascannons otherwise ignore. When you remove armor, they then have to find other ways of making saves, such as with cover saves. Lucky for us, a Order from your Company Command Squad is 'Fire on my target!' which means if your
CCS can see the target, and the order gets through, the target has to re-roll any successful cover saves.
Now, as neat as this is, you as an Imperial Guard player have to realize that your most common weapon is the lowly lasgaun. It is only
Str 3 and allows any armor save. The only good thing about it is that you have a 24" range and the weapon is Rapid Fire (at 12" or less). This weapon uses the tactic of the heavy bolter. You throw out as many shots as possible, and hope enough hit, wound, and failed armor saves gives you a kill or two. There is also an Order called 'First rank Fire! Second rank Fire!' that gives your lasguns (and only lasguns) and extra shot. So 2 shots out to 24" and 3 shots within 12". Let me give you an example... I shot 52 lasgun shots at a Blood Angle Assault Squad with a Sang Priest (gives the unit Feel No Pain). After missing with nearly half the shots due to
BS 3, not getting a lot of wounds with a
Str 3 weapon vs T 4 marines, their 3+ armor save, and then Feel no Pain rolls for the few that did fail their armor save, I killed 1 guy... with 52 shots. And to a lot of experienced gamers, they might say that I was lucky to get that. You can't depend on just lasguns, but in a pinch shoot /a lot/ of them at your opponent when you have nothing else to do with them might kill a guy or two. Your real workhorses in killing things are your special and heavy weapons.
Now lets talk about special weapons and heavy weapons. If your attacking or if you want to charge for some odd reason (hey, sometimes it is better to charge them then let them charge you) you should look at melta guns. They only have a 12" range, but if a vehicle is within 6", you roll
2d6 armor penetration and it is
Str 8,
AP 1. There is also no 'Get's Hot!' roll for it so you don't accidently kill yourself. It is also cheaper (Dakka Dakka rules do not allow me to point points for equipment) than the Plasma gun and has the Assault rule, so you can fire them and then charge... which you can't with Plasma guns and even Lasguns. On a side note,
Str 8 does have a habbit of inflicting Instant Death against multi-wound T4 units... like on a marine Captain that doesn't have Eternal Warrior.
Plasma guns are /huge/ in 6th because they are
Str 7,
AP 2, 24" range Rapid Fire weapon. This means if they are within 12", you get 2 shots! They are not as effective against vehicles as Meltas are, but a light armor transport (
AV 12 or less) can easily be destroyed by Plasma. The range means you start hurting the enemy at range, they have the same range and Rapid Fire rule as the Lasguns so have excellent synergy there as well. If someone charges you, they will not like eating two plasma shots per plasma, plus all the lasgun shots (plasma units really should never charge an enemy...make them charge you). The big problem with Plasma is the cost (most expensive special weapon
IG have) and the 'Gets Hot!' rule, which means every time you roll a one on a 'To Hit' roll the shooter automaticly suffers a wound. You get to roll your 5+ armor save, but if you fail you lose the Plasma gun. And the more shots you take, the better chance you get to roll a one.
Sniper Rifles, Grenade launchers, and Flamers all have a place. First off, they are cheap, and a
IG player should never waste a special weapon slot. Flamers don't roll to hit, so a
BS 3 Guardsman will always hit his target and Flamers do multiple hits on Overwatch (d3) and the enemy can not take cover saves against it. This is probably the 3rd best special weapon,
IMO. But it has a short range and may only fire a few times in the game. Sniper rifles are a close tie, because they have good range and have the 'Rend' special ability. Every Wound roll of a 6 makes the Wound
AP 2 (thus ignoring armor) and against a vehicle it allows a extra d3 or armor Pen (to a max of 12).
IMO, if you do sniper Rifles, you want a lot of them for better chances of getting Rending attacks. Also, this is a great weapon to take down High Toughness Monsterous Creatures because you always wound on a 4+, regardless of toughness. An Eldar Wraithlord has a Toughness 8 for example and is a
MC (unless it changes with the new Codex). Grenade Launchers though...they are Assault and have good range, but a
Str 3,
AP 6 blast (frag shot) blows and a
Str 6 Krak shot is decent, but it is
AP 4 and that is not. The standard for
40k is a Space marine, and if you have a single shot weapon that allows Power Armor saves, your really wasting your points and your time.
Heavy weapons... real easy breakdown here. Lascannons are king.
Str 9,
AP 2 at 48" has a chance to penetrate
AV 14, Instant kill T4 multi wound figs, and pretty much kills infantry 1 fig at a time... any infantry that doesn't have a reliable Invuln save or cover save. Drawback is that it is also the most expensive Heavy Weapon you have and most heavy weapon squads and platoons are
BS 3, so your only hitting 50% of the time. Missile Launchers are the next most expensive heavy weapon, but they are not the second best. Their Frag missle (
Str 4, AP6) and their Krak missile (
Str 8,
AP 3) are decent. But
Str 8 can only glance
AV 14 and the Frag doesn't kill enough Hoard that other weapons can do cheaper. It just doesn't do either job better than other weapons... if you shoot at a Transport, a
AC does it better for less points. If you had spent 5pts more, you /could/ have effected that
AV 14. This leads me to the
AC, the second best heavy weapon.
Str 7,
SP 4, TWO SHOTS. The
Str means you can fire on transports, the
AP+
Str means you can hurt hoards better than Frag, and against good armored infantry, you have a extra shot to force them to make two saves. That extra shot also means, on
BS 3, that you have a 75% chance of hitting with at least 1 shot, which is /really/ good for Guard. This is really the most versital weapon Guard have, but it can not touch the targets
LCs can. This is why they compliment each other and are the best two weapons, specially when mixed in your list (these units have
LCs, these have
ACs... never mix weapons, you always want make sure all of your weapons effect the target the same).
As for Heavy Bolters and Mortars, they are really only useful against Hoards... but they are cheap. At the end of the day, you can ask yourself if you would have spent 5pts more for a
AC would have been better and done more for your list.
HB shots vs 6
AC shots, even against hoards such as Orks and Nids, the
AC is killing more.
The problem most
IG players face is this... the
IG special weapon pack is a single melta gun and Plasma gun for $15 bucks. Your spending $45 bucks for potentially 1 squad. Or you can spend $40 bucks and get 20
plasma guns or
melta guns by doing alittle work and using the
GL arms to use these. I even leave on the glove, as I say it is a padded glove to protect the user and paint it brown. Heavy weapon squads can also be multi-purpose with using magnets, using the kneeling legs from the
CCS and getting extra bases to make multiple units out of one box. You have to learn to streach your money... if anything, hit up stores like
this ASAP as
GW is trying to shut down bit sellers. It will be harder to get them shortly.
Hope this helps... Good luck!
Automatically Appended Next Post:
Your right... the posting of the lists was poorly done and where at a quick glance with all of the units looking to be listed under the
PCS and not having PIS.
I hate it when people do not understand they can list a total for the unit, just can't list the equipment costs. I look for those point breaks.
"We need a new driver, this one is dead" 
Imperial Guard 4000 points
Space wolves 2500 points
grey knights 2000 points
need to read more 
Orks, 
Eldar, 
Lamentors, 
Pre-Heresy EC, 
CSM EC, and 
IG. 