Yes, I do, in fact, prefer my games to be pretty much the same from iteration to iteration.
That's why I'm excited for the new Donkey Kong, that's why I'm excited for the new Zelda, and that's why I'm excited for the new Portal, cause I know the past games they made were golden, so I know that if they don't fuck up the formula too much the new games will be golden, too.
If I wanted something new, well, that's what new franchises are for, and I tend to get pissed when I go out to try something new and discover that it's exactly like another game I've already played, only not as good. (that's why I'm almost completely ignoring shooters now, they're all Call of Duty/Halo/Gears of War clones and the repetition's really annoying me)
I guess I'm just the kind of guy who likes the familiar to remain familiar, keep what works working while adding on to it, and only really wants experiments to happen in either spin-offs or completely different games.
EDIT: Oh, yeah, I bought SMG2, and guess what?
I love it.
EDIT EDIT:
Cake.