I'd like to think that the tour bus was a symbol for the creators and viewers of the show, but I'm not sure that Simon et al. are all that self-aware. My wife is from New Orleans and she refuses to watch it. She expected it to be "Katrina Porn." I predicted that wouldn't be the case, but so far it has been, 100%.
It's not so much that the characters are unlikable (as most of them are), it's that they're so one-dimensional. At some point in a recent episode, one of them whined, "I JUST WANT MY CITY BACK!" That was the moment where I gave up my last bit of hope for the show.