actually it turns out only the vehicles do this... If the bodies are fresh a necron lord can rez everything but after a while it's impossible.
The campaign is a little stale. No real objectives in most of the maps except for demolish your opponents hq. Kinda like rise of legends without the pain of having to kill everything.
So far, my nemesis with the tau has been the IG amazingly. Primairly because the IG is also infantry based but their infantry is designed to be so much chaff so that the kasarkin or orgryn or whatever squads will be able to murder my poor fire warriors.
But the up side is that the only thing that can oppose me in the Space Marines is a dreadnaught, and that's if I haven't got the final tier of units yet. (the major letdown of the Tau is that they have trouble with a vehicles).
Eldar just can't stand up to fire warriors range/power combonation.
Chaos are just easy because the comp likes to spam cultists
Orks are a pain. Because once they bum rush you enough and get in close you get murdered. usually I take care of this by having either a Crisis unit or my commander running around with a flame thrower.
The best way to kill Tau is to get a bunch of fast infantry that are hand to hand and charge... if your fighting lone units of fire warriors it'll be easy because fire warriors have absolutly no Sight range. But if theres a pathfinder squad, or the Commander nearby your screwed because the Tau have such incredible range. Also tau bases suck for turtles because there is no such thing as a static defense... only listening posts.
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The fighting tactics against Tau are a given, since close combat is their "racial" lack, so to say. In the demo the kroot couldn't really outfigth anything and so you had to rely on long range, kroot teams would just suicide themselves on the higher tier Astartes. well, kroot hounds were okay, but you couldn't train much of them and the got tied up fast. Everything else sounds pretty good.
I'm curious about IG however, I've never personally played as them, but the idea I've gotten from other players is that they are basically relying in entrenchments and tracked heavy armor. Yet you comment on their high constitution, if I understood correctly, so how are they supposed to be played in DoW? In the demo you could turtle really effectively and build a battleline through the levels, but entrenchment is not really modelled to the game.