hmmmm this is a tough one
fav RTS: C&C and most sequels, cept tiberian sun, but i definetely loved most of the series, westwood rocks
RPG: toss-up between chrono trigger, KOTOR and diablo2, been playing d2 for almost 2 years now and still addicted.....
FPS: Starsiege tribes, most of you probably never heard of this game
loved it, in my opinion the best team-based FPS ever made, the sequel i didn't like as much, but still cool.
can't wait for the next installment, tribes:vengence
and for those interested, T1 and T2 are gonna be avail free in some mag in june i believe, computer gaming world or something.. can't remember exactly... and also gonna be available on file planet
definetely worth the download methinks
but i already have both