IMHO the half time show sucked, really poor acoustics and seemed more of a frenzied attempt to perform like a pack of maniacs, than to demonstrate any talent.
Don't get me wrong I like both groups music but that show sucked bad.
Ok, but, you can read the other comments and you can see the NFL's success at this approach; get more total fans, including people who could not care less about football, by offering half time extravaganza's that non football fans will watch, and talk about, and football fans will simply suffer through.
It's really no different than the marching bands of days gone by. Hell, even I felt a real sense of obligation to find out who the hell Bruno Mars is given I was going to end up watching. Guy is talented as all hell. The fun in it for me is trying to figure out who is live and who is memorex. All the vocals seemed live, the horns not, figure the drum kits they were just playing along as I didn't see a single mic and the guitars had to be canned especially the Chili Pepper guitarist whose lead was spot on in the middle of the seizure he performed.
I despised half time shows when it was just marching bands. This crap they do now, I've developed a comfort level with that and the inane commercials of just being amused at how stupid it all is and that we gobble it up.