I liked Act of war, it was one of the few games i could be bothered to complete infact

It did annoy me the fact that you couldn't zoom out very far, so you could never really get a sense of the full battlefield...
Didn't like Star Wars: Empire At War very much, both the ground and space missions were pretty lame, and the overall stratagy bit was carp aswell.
I didn't think Dawn of war was all that good to be honest. I completed it, but can't see what all the fuss was about. It was pretty easy, and I hated the storyline\cutscenes, they were just so boring & nerdy!!!!
Civ4 is pretty brilliant, but I only really play it over a LAN with my brother, playing online games over the years has pretty much turned me off any single player game at all, I just dont see the point! You do need a couple of days free to start a Civ4-athon tho
Galactic Civillisations 2 is supposed to be pretty brilliant aswell, although i've not got round to playing it. If it is 1/2 as good as MOO2 or Ascendancy it will be great!