I've probably mentioned this a bajillion times by now, but I have only been playing Rock Band (and music game, in general) since July of 2011. In that time, though, it has not only become my most played console game, it has become virtually my exclusive console game. While I have, on a couple occasions played games I already owned, I have not, as far as I recall, played a single new game, AAA or otherwise, since I first started playing Rock Band 3. It really was the perfect storm for me, because I loved games and I loved music, put them together and it is the ideal interactive experience for me.
When I first decided to get into music games (as an early birthday present to myself), it was either Guitar Hero or Rock Band (obviously). Admittedly there are elements of Guitar Hero (the more fantastical and video-game-y elements) and songs I would like in the Rock Band series. That said, looking at the available soundtrack and DLC for the Rock Band series and reading the reviews, both player and professional, it was the clear choice for me. And I'm very glad I made that decision. You have done an amazing job thus far, Harmonix, I wish you the best of luck for the future. You will always have a devoted fan in me.