I've never been so unenthused over a GH game in my life. Partially because I'm not a huge Aerosmith fan, and partially because Activision has done exactly what I was afraid of and started whoring out the GH series like whoa.
And yeah, I don't think it's worth $60. I'll probably rent it from Gamefly to play through the songs I like, but I don't have any real desire to own it.