[citation][nom]KawiNinjaZX[/nom]"pro" mode? Like expert can't be hard enough. Rock band needs to get some Tool.[/citation]
Expert mode can be challenging, but it's still not as hard as the real thing since you're only dealing with 5 buttons and a single "string" instead of an entire fretboard and six strings.
That said, I've found a few instances in RockBand where they actually made it harder than "real life" because they are forcing you to re-create certain effects with excessive strumming and button mashing that were done simply with an effects pedal by the real artist, such as in a certain Audioslave song that I can't remember the name of right now. Maybe that's what they need to add next, effects pedals!
And I agree there needs to be some Tool in RockBand because right now they have none at all.