I agree with most of the thread here, that it's mostly FPS that's seen the listed negative changes. As someone who didn't play any of the old FPS games when they came out, but is rather picking them up now in the last few years, I can say that things have gotten worse without personal risk of nostalgia. Other genres have done well, and definitely improved, but there are so many things I see wrong in modern FPS that's only just now beginning to change back for the better. For instance, I played some Titanfall when they released that marketing demo (not calling it a beta), and hated every bit of it, but was goddamn THRILLED to see a faster movement system with things like double jump in it in what is otherwise a straight CoD clone. It gives me hope.
A huge part of it (again, specific to FPS) I would indeed say can be blamed on the dominance of consoles. The horrid accuracy of a controller compared to mouse/keyboard, restricted FOV (lucky to get 90, I always check for hacky ways to get up to 120), painfully slow movement, the existence of aim-down-sights, compromises to level design to squeeze 'good' graphics out of outdated hardware, and an all around casual audience has really worked over the genre, even if you don't blame it all on CoD4's success. But, as has already been mentioned, the prevalence of MMS is a fad, and hopefully we're near the end of it.
Also, to touch on indie games... the large number of platformers is largely due to how much easier it is for a small team (or one person) to make a platformer using the many existing engines than making a 3D or more complex game. The simple graphic styles are also typically a product of necessity, though many do like the pixel art style. I'd also say that's it's very possible for a game to be graphically unimpressive but still have a good aesthetic, and that games that try to look realistic typically appear dated in a few years (even as graphics advancement does slow down).
Good god, welcome to wall of textville, population every video game nerd ever. I think I managed to write 3 paragraphs without saying anything.