I used to think that too. But my wife finally prevailed on me to watch it. And... it's pretty good. These people are real artists -- this ain't Milli Vanilli. If it were, I'd concede your point.
I'd think most in this community would find it at least mildly interesting. It's about saying it with music. So at least it's not about murder, lawyers, doctors, or the police (so called FUD shows) -- which is about 80% of TV that isn't staged "reality shows". IOW, at least it's different. It would be worth keeping around just for that, but it has turned out to be wildly popular (IOW, it's a money machine) so it's certainly here for a while. Just sayin'.