Green Day Rock Band has sold 540k plus this year.
Rock Band 3 has sold 350k.
Granted Green Day has had since June instead of 3 weeks, but most sales are in the first month anyway for lots of games. My point is that Rock Band 3 ain't selling jack.
And RB: Green Day is still my favorite. :) But it reiterates that custom track packs for an existing platform of RB is what people would rather have. I'll buy RB3 when it gets down to $30 or so, which may be in a week or two at this rate.