I've played guitar for over 10 years but could never really get into Rocksmith. Might as well just play guitar? Rock Band is great when you've got friends round, basically a souped up Karaoke machine!
I think they never got in before because they were exclusive to Guitar Hero (Knights of Cydonia, Plug in Baby, Assassin, Exo-Politics, Supermassive Black Hole, Stockholm Syndrome & Uprising all featured in GH titles).
They've announced around 75 songs for the new Guitar Hero game and a lot of them are from previous titles but none of them are Muse. Makes me think that now Harmonix might have a chance of getting them in Rock Band? If you're a fan of the game it's worth a try I suppose