Overall, Oblivion has to be one of the greatest games of them all, its #8 on my list underneath the old DOOM collectors edition, Halo 2, Call of Duty 2, Halo, and #1 is the upcoming Halo 3 (may it rule without a single doubt). Oblivion has the greatest graphics and physics engine I've ever seen and a smart AI (but just a little on the dumb side). It has tons of weapons and armor that you can choose to be on your character (deadric armor is the best on my list). Its lighting is the best ive ever seen as well.
Although, there are some downsides on it.
#1. a whole ton of things cost too much money (house in Skingrad)
#2.you cannot shoot a bow off a horse.
#3.some places and missions are just too easy.
I would give this game a top rating if only my 360 could take the weight of some places and things.
This is a game that you should buy a 360 for, no doubt.