Anyone else have the issue of the game slowing down when a lot is happening on screen? It happens a lot in co-op mode if you have star power activated - the lyrics have already been sung before the game catches up. It's cost me many a big combo.
Also, just generally better mic pickup. The talky parts can be very frustrating.
Disc swapping isn't that much of a problem imo, and I couldn't care less about gamerscore for what is a party game. I do agree about the slow menus though. It takes ages for the store to load up, as well as your friend interface.