A couple main reasons.. I had always been a Nintendo exclusive console owner but this was the first gen I felt I needed something more in addition to the Wii. I was debating between the PS3 and 360, knowing I was going to get one of them, but ulimately decided on the 360 because it was the better value at the time, and seemed to have better games. Also, it had the support of Rare, which, at the time, was one of my favorite developers next to Nintendo.