what are your top 20 games of all time and top 5 this gen?

[Noolsey]

Current Gen:

1: Team Fortress 2
2: Portal
3: Company Of Heroes
4: Half Life 2: Episode 2
5: Medieval II: Total War

Overall:

1: Team Fortress 2
2: Portal
3: Company Of Heroes
4: Command And Conquer: Red Alert 2
5: Half Life 2: Episode 2
6: Medieval II: Total War
7: Half Life 2: Episode 1
8: Warhammer 40K: Dawn Of War
9: Final Fantasy VIII
10: Tales Of Symphonia
11: S.T.A.L.K.E.R: Shadow Of Chernobyl
12: Bioshock
13: Command And Conquer Generals
14: Shadow Of The Colossus
15: Metal Gear Solid 2: Sons Of Liberty
16: Vagrant Story
17: World In Conflict
18: Call Of Duty 4 (Single Player)
19: Zelda II: The Adventure Of Link
20: Parasite Eve

Ask me at any other time and the list will probably be completely different. I've chosen games that I've spent a lot of time on in the past, that I wouldn't hate playing today. 15 of them I've played recently.