You already know what to expect from this "game" but what i will add is that I'd have been happier if more songs/song versions from "S&M" had been included. This disk for whatever its price is does not offer enough for your money where you can actually feel you've made out when you buy it. Guitar Hero World Tour has a better setlist which is far more diverse.
What really sucks is you can't use downloaded content from other GH games while this disk is in the console. There should have been an allowance for playing music from the HDD.