5 Games per System (forget collectibles and boxsets).
What would they be?

For me; in no Particular order.

PC
-Fallout 3
-Dawn of War II
-Left 4 Dead
-Half-Life
-Battlefield 2

PS3
-Street Fighter IV
-Killzone 2
-Resistance 2
-Battlefield: Bad Company
-Resident Evil 5

Wii
-Super Smash Bros. Brawl
-Mario Kart Wii
-House of the Dead 2 & 3 Return
-Red Steel
-Super Mario Galaxy


Xbox360 (Don't have; but if I did)
-Fable II
-Gears of War 2
-Lost Odyssey
-Dead Rising
-Bioshock