I fail it.
I dislike MMS's as much as the next guy here, but that doesn't mean that they're not ridiculously popular. What you call formulaic I think is just a sign that you (and I) don't like the genre. You might find them boring and uninteresting, but if they changed things up to make them more interesting for people like you and I, they'd probably alienate the people who already enjoy those games, will buy them, and don't want them to change radically.
What you call maturing, I call unimaginative.
I'm sure there are other genres that you enjoy that you feel that way about. Using myself as an example, I'll probably see Iron Man 3 as soon as it comes out. I sure as hell hope they don't ruin it by trying to do some groundbreaking shit in it. You go to those knowing what you're getting, and any sort of radical deviation from that is likely to evoke feelings of "What the hell were they thinking?!", rather than "What I twist!".
Absolutely. It seems like a lot of these games feel like their gimmick defines their game, and instead of it being there to spice things up, they ride-or-die on it. It's like a chef being like "I know! I'll make an entire three-course meal out of eggplant! No one's ever done that before!" ... yeah, for good reason. Braid, while I did enjoy it quite a bit, was really guilty of this.
I definitely agree. I'm not opposed to new concepts and innovative gameplay, but I'm getting a bit tired of games that come up with one new idea, latch onto it, and design the entire game around it instead of using that mechanic alongside an existing formula known to play well. I think a lot of the indie platformers, for example, would be more fun if they worked their gimmicks in with other features already known to work well in the genre.
It all reminds me of that movie Cloverfield. They shot the whole movie from the perspective of a dude within the movie holding a camera. It was revolutionary! It had never been done before! ... and guess what? It sucked! It felt annoying, gimmicky, and shoehorned. The camera was incredibly shaky (as it would be in the middle of a fucking godzilla attack), and you didn't get good views of the things you wanted to see.
I'm too am not against new concepts and innovation, but when you're sacrificing quality for the sake of novelty, I have a real problem with it.