So tommarow i am going to buy a new xbox360 game i alredy own Gta iv, Assassin's Creed, and Army of Two. So I am wondering is there any other Xbox 360 game they i should buy that is very good? 

I would try not to aim for series because i just recently joined the Xbox family (owned any type of Xbox) probably misunderstanding any previos plots that lead to flashback foreshadowing ect. So if you have any good suggetions post here I am leaning towards Bad Company so far.