Yeah, I bought a 360 about two year ago and found that most of the games were overrated (Halo being one)
I'm truly disappointed in the games that are released. Although GTA4 is one of the best games I've played in years.
To keep this short, I purchased my Xbox 360 in June of 2006 and have had problems with it starting in the summer of 2008. Just by moving the system while a disk is spinning, large circular scratches appear on the disk rendering the game unplayable; The disk tray jams often; and finally, I was not too impressed with its graphics capabilities. However, even though it is overrated, I would recommend purchasing a newer version of the Xbox 360. There are more overrated games than underrated games: so choose wisely based on reviews.