Well for Australians its Rock Band ONE (JUST RELEASED TOO, yes I said TOO not TWO) or GH:WT so WT being the shoddier product (The kit is absolutely dreadful, I played a mates) than RB2 I would naturally choose RB2 if I could, but I can't, so shamefully I have to take GH:WT.
How about learn to play drums in Real Life, you get alot more enjoyment (As you can see the ENTIRE SONG before you play, not just a second ahead depending) in alot more time (Practice, setting up etc.).
Oh wait, I do, and am currently Sight Reading Expert. Top THAT.