It's unfortunate that we can't have access to all of the RBN content that the XBOX does, but I also think the selection process for what gets ported onto the PS3 is a lil bit unfair. Sure, it's about selecting what songs they think will sell the most, but if they're getting those stats from scores posted on the online leaderboards, that's a bit flawed. XBOX users have to pay to play online, not everyone would play online, thus it's not really representing what all XBOX users are actually purchasing.
I guess it's just one of those things where you can't please everyone.
Meh, just give me "Fragments" by an Unkindness and i'll be more than happy!