[PC] What is your Favorite PC game EVER?

Unreal Tournament '99 and Unreal Tournament 2004 - Simply because of the high-speed fragfest and lots of fun. While the music in '99 was near godlike for its beauty (Skyward Fire and Botpack #9 are my absolute favorites), 2004 boasted vehicles and basically more modes (Favorite tracks here are DM-Rise and Serenity).

Deus Ex - As many have mentioned, Deus Ex is pretty deep and fun. You can customize your character's abilities to well-suit the field while the story is just fun. I saw what's what and I am incredibly impressed.

Serious Sam: The Second Encounter - No, not Serious Sam II. This Serious Sam has fun written all over it. Minus sometimes his one-liners that are very very cheesy, nothing sates my excitement while unloading a double-barrel shotgun round to a Beheaded Kamikaze (which is in my opinion, one of the best created villians in any game).

Warhammer 40,000: Dawn of War - While not as innovative as other RTS games out there, this features a squad unit which basically almost eliminates making soldiers just to create an army (while you have to create another soldier for another squad). Of course, there are also 3 races which I like. Bloodthirsters are fucking crazy while the Imperium's Commander has Orbital Bombardment. Awesome shit.

Rome: Total War - Definitely a favorite of mine, this RTS game doesn't employ building up structures and creating units and all that. This game is all about soldiers in battle en masse. Deployment of pockets of soldiers is awesome and is also inspired by near damn factual events (except the names: Julii, Brutii and Scipii [Scipiones]). It's like watching a panoramic view of soldiers fighting. So many. Strategy is vital here since you don't have buildings to construct soldiers, you'll just have to depend on your men that's on the field. In short, this game is epic and a whole lot of fun. Plus, the music is well-suited for the game and there are some historical battles to be replayed, seeing if the player can reverse the soldiers' fates to what actually happened. A definite favorite of mine.

Jam it back in, in the dark.