The actual music isn't terrible--I can see somebody liking it, even if I don't. But the girls themselves, I don't like them at all. 9/10 are completely talentless - from what I've seen, they're not dancers, and most of them have awful voices - and they're not even any more than average lookers (some of them are actually kinda gross) to make up for it.
I wish they'd just disappear, to be honest. The only one I can think of who's worth anything is Takahashi.