Rock Band 2 has similar vocal-part problems. I'm the only one at work who's willing to sing and most of the songs are pretty shitty. Rock Band 1's song list was way the hell better for vocalist fun.
World Tour was ruined when they fucked with the timing windows for HO-POs.
Rock band is the game people love until they figure out expert just plain doesn't work. Now world tour emulates that same amount of shittiness. Solos that I could pass blindfolded in guitar hero 3 are now fucking impossible in world tour.