I rented LEGO Rock Band and Beatles Rock Band over the long weekend. LEGO Rock Band is much closer to the Rock Band 2 style that I love. Both games are entirely too easy on Medium, and there are few songs that are just pure fun to play. I love the LEGO humor and game structure, but the song list just isn't robust enough for me to buy the game.
Worst song in RB history contender: We Will Rock You
Sure, people besides the vocalist have parts before the ending solo, but it is the most mind-numbingly boring part imaginable.