lol for PC games...I suggest
If you like action/shooter genre
Mass Effect 2, Bioshock 1 and/or 2, Fallout 3, Borderlands. (No call of duty or Battlefield, mainly cuz theres gonna be bc3 and blackops)
If you like RPG/Adventure games then
Dragon Age Origins, Torch Light, The Witcher or Starcraft 2 (Main Campaign somewhat have rpg elements)
If you like Fighting games
Street Fighter 4 or Blazblue (Calamity Trigger or Continuum Shift)
If you like mmo
try Kabod Online (Yea its an Adult MMO which means you'll see naked monsters and your armors breaks until you see your character almost naked), Cabal Online or Soul of the Ultimate Nation <---- ALL These are FREE TO PLAY
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For PS3
RPG/Adventure
Demon Souls, Valkyria Chronicles, FF13
Shooter/Adventure
Uncharted 1 and 2, Devil May Cry 4, Bayonetta, Killzone 2, MSG4, GTA4, and Red Read Redemption
Fighting
same as my pc suggestion which addtion of tekken 6 and soul caliber 4