If you are gaming on the 360 I know you can check the demo out (considering you are a gold member). The gameplay is very traditional hack and slash. You perform combos, upgrade moves, perform miminal platforming tasks.
What set this apart for me though was the atmosphere. The game's dripping in it! And Jack Black (trust me, I was a little aprehensive too) nails it with a Shool of Rock-esque bad@$$ roadie character! CHECK IT!