That is a weird list, anyway, here are my top games

PS3:

1. Uncharted: Drake's Fortune
2. Grand Theft Auto IV
3. Call of Duty 4: Modern Warfare
4. Killzone 2
5. Ratchet & Clank: Tools of Destruction

360:

1. Mass Effect
2. Gears of War 2
3. Lost Odyssey
4. Assassin's Creed
5. Fable 2

PC:

1. Rome: Total War
2. Empire: Total War
3. Company of Heroes
4. World in Conflict
5. Medievil II: Total War

Since we're doing top 5's:

PS3:
1 - Metal Gear Solid 4.
2 - Uncharted: Drakes Fortune.
3 - Little Big Planet.
4 - Killzone 2.
5 - inFamous.

Xbox 360:
1 - Gears of War.
2 - Lost Odyssey.
3 - Mass Effect.
4 - Gears of War 2.
5 - Halo 3 (hate this game but it is essential to 360's collection).

Wii:
1 - Super Mario Galaxy.
2 - Super Smash Bros. Brawl.
3 - The Legend of Zelda TP.
4 - Resident Evil 4 Wii.
5 - Zack and Wiki.

Replace AoE3 with AoE2 and Crysis with anything else (maybe Starcraft)