the pc version is buggy as all hell, but if you prefer to play fps on pc then there ya go. just get it on a console, 360 if ya can because it's said to play better compared to the ps3 and has exclusive downloadable content.
asy, waw is good clean fun. granted, it's the exact same thing as cod 4 with shitty guns. i don't think i've never played any of the treyarch cod games so i can't really comment on that. the graphics are top notch and coops been pretty decent and problem free (barring a bit of slowdown here and there). i'm a sucker for good or even plausible dialogue and story however, hence why i can't stand gears. bout halfway thru the story and i don't care for any of the characters at all. and vehicle sections in any fps game are a fucking snore. haven't touched on multiplayer, but it's looking decent because it's got more perks and such.
mirror's edge is a rent, i've been hearing you can clock it in 6 hours or so. that being said i'm getting it off ea for free, might take a month or so though to get it. waiting on my damn copy of dead space to get here.