Bierflesje

I split my choice in three games, multiplayer, singleplayer and both.

Multi:
Halo 3 - Best online gameplay. Never played a game this much online. Everything is just so perfectly done. And what's not to like about reviewing your match highlights (Killing Frenzy anyone?)

Single:
Bioshock - Revolutionary. Graphics are awesome. Sound is awesome. Story is aresome. Gameplay is awesome....just awesome.

Both:
Guitar Hero III - Great soundtrack and addictive as hell. This game really pushes you to go further. Hit that extra note or complete your favorite song on Expert (which is reeaally hard).