well everything eldar sounded female, which is off in my opinion. everything chaos was irritating as fuck. the marines aren't too bad, but the commander unit pissed me off. a lot of the sound bytes were far too long and would continue on long after you selected, moved and actioned the unit. it wasn't all bad, some of the sound bytes are pretty cool, but on the whole i thought it was a bit over the top and hammy - you know, very "video-gamey" (in a bad way).
as for the cutscenes, the voices were so over the top. every single bloody word was said with emphasis, and the pauses between some words and sentences were just odd. i think the cutscenes alerted me to how bad the voice acting was, and made me biased against all the other voices in the game. but seriously, the voice acting in the cut scenes is some of the worst i've ever heard.