I've only played a few campaign missions so far, but....
- Actual, inaccurate artillary. Wheee!
- Customizable squads.
- Knocking down asshole Ork hordes with missile launchers.

I cannot find a bad thing to say..... but questions, plenty. So, to that....
A - Is it just me, or are Assault Marines just this side of useless? They last for next to no time before going down, and thus far seem to primarily be useful as a damage screen for my Space Marines.
B - Is equipping squads to specialize a good way to go? As in a missile squad, a Bolter squad, etc? It seems to be the most effective, at the admitted cost of pushing the squad cap....
C - Turtling. Game seems to bloody well encourage it. Grab the point, and fortify it seems to be the way. Just a thought - I'd figured on it being "out" in this RTS generation.
D - Where can I find out more about the mythos? Space Orcs, Religious whackjobs with laser guns.... sounds interesting.
So..... yeah, basically. Will the generous of spirit please step forward?