Credit where credit is due. I went back to Blockbuster the next day after renting a game that has major bugs in it. Although the behind the counter guy said "We don't normally do this" he did let me exchange the game for Madden 08. which I have been loving. So kudos to Blockbuster for allowing me to trade it for another one without much hassle. I was prepared for quite a fight.
By the way, Madden 08 gives up XBox 360 achievements / points like they're candy. I've been able to get 685 gamer points without too much difficulty, in about 5 hours of game play. This game has really helped my gamerscore.