Honestly, it was pretty bad. It was a kids movie so not expecting much. I hear some reviews saying the way it portrayed rock music was offensive to rock fans, but honestly, I don't think a movie like this can really be taken that seriously...
idk if it's just me, but I like the idea of expanding the world, but again, with a kids movie like this one, what did you expect.
It'd just be a bunch of singing, dancing, and over-the-top stuff to keep kids' eyes on the screen or somethin to try and make a quick buck.