Hrm. I just hit 100 retail XBox 360 games, so much for making this my #100 ;) I own some crap already - Alone in the Dark (mainly cause of the horrible controls), Bomberman: Act Zero, Eragon (Sadly only bought this for achivements. Never again.), Soldier of Fortune: Payback yet it looks like this could even top Bomberman as worst game (mainly because that game was a $60 title that should have been a $5 XBLA title).
Looking at Gamerankings it has awhile to go. For retail games Shellshock 2 and Leisuiresuit Larry are 25% and 26% respectively and Rogue Warrior is rounded to 28%. Though a 20% is a great way to fight Leisuresuit Larry as worst 360 game of all time.
It's just that simple.







