You are only missing something Truely Superb in the way of gaming on the 360 if you don't have a copy of GH3 or Rock Band, All other gaming experiences have been left in the wake of my new found Guitar skillz.
Years ago I spent hours/days/weeks & then years killing my finger tips trying to get the sound I want, Nowadays I play GH3 & sound like kin Yngwie Malmsteen & Steve Vai rolled into one & I get gamer points into the bargain
Will I ever grow up ?
Not on your ******* life as long as you Young'uns keep getting tackle like this