CSM:
Best Unit:
Lash Prince w/ wings (what he is only 155pts?????) Best point by point
HQ in the game.
Worse:
chaos spawn but runner up is
CSM terminators (30pts base and then upgrades make them too expensive, so much more can be taken for less)
Nids:
Best:
Trygon Prime
Worst:
Warriors (3 wnd models are great until you have no invul and get instant killed by S 8 and above)
Dark Eldar:
Best:
Vect without a doubt (6 attacks with preferred enemy against everyone with a 3+
pw, a 12" range grenade that is S10 vs infantry and heals his wounds, AND a 4+ to steal intiative. Oh
btw a 2+ invul save)
worst:
Mandrakes (lmao, no explanation needed)
IG:
Best:
what do you get for 3
TL Las, outflank, fast vehicle, and transport capacity with F: 12 S: 12 R: 10? You get the best tank in the game for 130pts. Vendetta
Worst:
conscripts (never will I take these guys unless I am pulling a prank or wanting to waste points)
SM
Best:
Vulcan (yea these are all twin linked

)
Worst:
Sniper scouts (great on paper. bad in practice)
Orks
Best:
Gorzagh (I hate this guy)
Worst:
Bikers (they are over priced and get insant killed easily enough)
Tau
Best:
Broadsides (they hurt when you play them right)
Worst:
the rest of the army...