There's an interesting mix of things here, some of it I really agree with (Razorspam, multiple shot mid/high strength weapons) some of it I think is really...odd (Lash princes as answer to
DE?)
The basic gist is this -
DE hit hard. We hit so damn hard that your mammy is gonna feel it. We hit hard in shooting, we hit hard in assault. Plus we're fast, we come all the way across the board, give you a wedgie, and start wuss slapping you while laughing as we provide streaming video of the aforementioned mammy in pain from the blows.
Then you sneeze on us and we die.
The core advice I can give is - you want lots of vehicles to protect your men. Men outside vehicles will be drowned in poison and thrown into assault with invulnerable save packing
FNP meth heads on a bad acid trip - you don't want any of that.
You need a lot of vehicles to protect you too. Don't try to pay for tough vehicles, we're not impressed by that, you want
AV 11-12 vehicles, those are what give us problems. Yes, that makes no sense - it is
DE, deal with it.
Okay, so you're safe in your metal boxes, what now?
You need things that can shoot - preferably with a 48" range. You don't want to have to get out of your boxes though (can't get out,
DE will get me, can't get out,
DE will get me...) So Razorbacks and Chimera are good standouts of things that are good vs.
DE. Thus - Razorspam, the horrible Grey Knight
Str 8 Assault Cannon
TL Dreads of annoyingness - these are things that hurt
DE, because you'll rob us of speed and our paper plate protection.
After that you just want to pick apart the squads, at this stage you can start getting out of your vehicles more often, depending on how much you've hurt the
DE it might be safe.
If you're still alive by Turn 4-5 you know you've done something right.
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Specific army advice (aka - things I usually try to kill first/hate to see across from me)
Chaos - Um...you poor bastard. Pretty much bringing 3x Oblits is about as clever as you guys can really get. Most of this army is practically built to have
DE curbstomp them. I'd focus on Oblits, and get the rest of your men plasma/meltas and get them in Rhinos, try to drive up and shoot apart the
DE as best you're able. Pray a lot. DOn't ever bother with a Demon Prince - he'll be dead whenever we want him dead. Good luck.
Orks - Lootas are the magic button here. 3x Lootas, and in a mob at least 10 strong (15 is better) Each of these is basically a point and kill for any
DE vehicle. Bubblewrap them with something - boyz, grots, whatever - just prevent the
DE from getting a charge on them. The best Ork list will probably otherwise be a footslogging one - and hope the
DE player didn't bring 6x Venoms or 3x Razorwings. (or both...but maybe then he won't be able to kill your walkers...till Turn 2, psych! No - just hope he didn't bring enough AI, sometimes a new
DE general will do that)
Blood Angels - (You are aware these guys are probably one of the more competitive armies right now, probably moreso than
DE, yes?) My advice - Razorspam. Packing a fair spread of plasma wouldn't hurt - neither does the
FNP shenanigans as that will actually slow down your inevitable death to a storm of poison bullets that will come at you. But a fully tricked out
BA Razorspam list is on my short list for toughest matchups
DE have to face - it's probably top 5, and is certainly top 10.
Ultramarines - Ehhhh...it pains me to help the Ultrasmurfs. Well, probably the best Vanilla tools are simple things - Landspeeders are potent, and some dumber
DE generals will overlook them and their destructive powers. Razorbacks are still ace, and any sort of Razorspam list is solid. Predators and Rifleman Dreads will also serve you well - mobile and potent shooting in the mid
AV range, remember? Vanillas should *definitely* spend as much time as possible cowering in their boxes. Avoid foot units, also avoid paying out for Landraiders, as we mock them, same with Termies unless it's shooting Termies with Missile Pods and the ilk.
My best advice is you go out and get a
DE army and read my tactica so you can help us show how inferior all those other mewling man-child armies are