well, i think the main problem with U2 being on so many TV shows (superbowl, TRL, leno, etc.) is that we're accustomed to the musical performances on these shows to be CRAP. therefore, when we start seeing U2 on all these shows, it's a gut instinct to kind of cringe and wonder whether U2 is now crap. but the main thing to realize here is that U2's music is still awesome. and though it was hard for me to accept at first (yes, i cringed when i heard they were playing the superbowl), this actually might be a GOOD thing for the state of the music/entertainment industry.
for some reason- and bono has talked about this in interviews before- it is a taboo in the alterna/rock world to be ambitious- ie, to go on TV and make sure people hear your music. therefore, some great bands never really get the audience that they deserve- they may be the critics' darlings, but most of the world doesn't know who they are. in fact, for the most part, the only people who are willing to go out there and SELL their music are usually only marginally talented (ie, britney, nsync, etc.). i hope that U2 is showing the world that talented and respected bands can- and perhaps *should*- do the same thing! they should be ambitious! they can play TV shows, get their music on the radio, have a huge audience, and STILL be talented/respected!
in some ways, i think that U2 might be pioneering the way for younger talented rock bands... hopefully, they'll change the attitude that "good" music can never be in the Top 40. who knows, maybe the whole industry will change- maybe someday the top selling acts in the world will actually be the most talented as well.
probably wishful thinking, but you never know....
ps- sorry if this post was incoherent- it's been a loooong day at work, and i don't have time to read it over.