I won't pretend I'm not biased; Aerosmith is probably my favorite band ever and the only band I've seen live in concert (at least as of me typing this). It's definitely a weaker game than Guitar Hero 3, but it means a lot more to me, especially given the time in my life when it released. That said, GH3 is still probably the best game engine across all of GH and Rock Band, so the fact that it runs off of that one, however weaker, is a huge plus.