BioWare's Mass Effect is the best game ever (this second). It's an RPG for the Xbox 360, and it looks simply amazing. You're a human in space out to uncover the secrets of galactic holocaust which means, well, you have to shoot a lot of aliens right in the mouth.
Beyond its beauty and epic story, the game also has this great morality system where your character can be either a jerk or a nice guy (or any variation thereof), and the way he behaves will affect the story. Also, it has a lot of cool space guns which can be pointed at aliens to get them to do exactly what you want them to do.