I also agree that the mashed-up black eyed peas that were served as the halftime show were really terrible. Tom Petty, the Rolling Stones, and U2 all had FAR superior shows, and exhibited the fact that they still had the talent to do a live show in a stadium. I think that the peas are one of those many groups nowadays that totally suck in live performance, but with the wonders of modern recording studios, computers, and technicians, could turn out respectable albums.
The same could be said for that Christina Aguilera chick who couldn't sing our national anthem correctly. At least the young lady from the "Glee" TV show who sang America the Beautiful at the very start did a wonderful job - and she doesn't have gold albums on her wall (yet)!