Kaching, by any means rent this if you can instead of buying. Believe it or not (and it pains me to say this, considering how much I love Harmonix, and how much I was hoping the game would rock) this will be the only game ever that I bought that I'd be returning back for a store credit. It all bogs down that it's just painfully unfun, more like chore to play than it can provide any satisfaction. Everything about it feels un-engaging and pedestrian, which is a major blow for this type of game.
FYI, I loved Eyetoy Groove, and thought that game was a lot of fun.