This game has really brought me back into Guitar Hero (I'd preferred Rock Band over Guitar Hero since GH3 was pants)!! I'm loving it!! And we've imported all our other Guitar Hero games (that are compatible) into it too. So we've got craploads of songs all on one game. XP
The characters look so much better than back in their GH3 days. And I'm loving the transformations so far too. Hehe!!
But the character creation is, as always, lacking... very much so. It really lets it down.