I wish they would have less goals that require you to buy songs in order to participate. Too many of them require either songs that I don't own, or that I don't want to buy. I own over 400 songs.. Please let me use some of those!
Also, I keep getting Score Wars challenges for friends that don't even own the full game. Why would it keep setting this up? I get nothing for people that don't play. Kind of a bummer to an otherwise great game.