[360] Essential 360 Games

Halo games (yes really )
Forza if you like cars
Batman is a great game overall
Red dead redemption; GTA in the wild west, lots of fun
Crackdown (I only have the first one but the sequel is supposed to be the same with tweaks so get that)
Moder Warfare 1&2; sp is fun and nice, multi is also fun even with all the glitches.
Gears of War games are just pure manly fun
Shadow Complex (xbla) is a great moderntake on retro metroidesque platform games.
Deathspank (xbla); Diablo with monkey island humor (same writer), incredibly fun!
Assassins creed 1; lacks a bit in gameplay (not as bad as people make it out to be, it's not that repetetive unless you do all the sidequests on purpose, the feeling and surroundings are unmatched) but the story and feeling is a+.
Assassins creed 2; Improved in every way, story is ridic good with shitton of backstory if you want to indulge yourself, they have in some way or another included every myth and historical event that ever transpired.
Fable 2 lacks in certain departments (no homo) but is fun overall

no homo