COD's consistent popularity is so weird to me because even though its popularity never dwindled, I honestly can't recall the last time I've heard anyone in real life, in all of my social circles, say they bought or were excited for a game in the franchise.
Seeing Rock Band and Guitar Hero on there makes me sad though, those were such fun games and I feel like they could've really been the catalysts that made the rhythm game market in the states get bigger. Sadly, as with most big, new things, they just had to oversaturate the market.