I Want
From Dust (Xbox 360)

An interesting mix of Populous, Black & White and Lemmings, with a stunning visual style.

I've Beaten
Ace Combat 6: Fires of Liberation (Xbox 360)
Sorry, we're too busy joygasming over awesome graphics and ball-busting missions to come up with anything coherent to say besides: Go. Buy. NOW.
Mirror's Edge (Xbox 360)

A unique and enjoyable re-imagining of the First-Person Action Adventure genre, though a little rough in some small bits (also be wary if you suffer from motion sickness).

Mass Effect (Xbox 360)
Graphics are sharp and the story is one worth multiple plays - even if it only has one ending. This RPG/Shooter gives an actual sense of space exploration.
I Love
Ace Combat 6: Fires of Liberation (Xbox 360)
Sorry, we're too busy joygasming over awesome graphics and ball-busting missions to come up with anything coherent to say besides: Go. Buy. NOW.
Mirror's Edge (Xbox 360)

A unique and enjoyable re-imagining of the First-Person Action Adventure genre, though a little rough in some small bits (also be wary if you suffer from motion sickness).

Mass Effect (Xbox 360)
Graphics are sharp and the story is one worth multiple plays - even if it only has one ending. This RPG/Shooter gives an actual sense of space exploration.