Everyone hates them because they have the girls, the fame, and the greatest thing is that they aren't annoying about it. They make music that alot of people love.
Jonas Brothers are one of those bands that alot of people will dislike purely to dislike them, not because they have a valid reason. Or they say they dislike them, but they do like their music.
Love Bug is a really good song in my books, I learnt it on guitar the other day (I suck though, it's really not that hard to learn. Took me ages.)
Burinin' Up is good too. All in all, I like them =]