This really doesn't make sense to me. The Uncharted games have not really changed aside from becoming better looking and more cinematic.
I don't play Halo, but from what I can tell not a whole lot changes from game to game.
Zelda, and mainline 3D Mario change far more from game to game imo. Twilight Princess was the only recent one which was supposed to be a throwback and thus didn't change much, and of course SMG2 was a direct sequel. I see plenty of reason for people to be interested in new Nintendo games.
However, what I'm saying is that people shouldn't be surprised if some don't have the same amount of hype for the games. The reasons why some wouldn't are pretty understandable.