I've been a game designer at a few different development studios, and the large publicly traded companies favor game concepts that are likely to be a wild success. A minimum bar of $100 million in predicted profits is not an uncommon requirement for a project. And, it's easier to get predictions of $100 million in sales when the game concept is similar to another game that sold that much. That's why there are so many sequels and copycats, and it's exactly the types of games in the original post: the Calls of Duty's, the MMOs, etc.It does sometimes seem that those are the only types of games out there, but that's just their marketing flooding everything. Those companies won't think twice about dropping down $20 mil for a marketing campaign.
But as folks have pointed out, there are plenty of innovative games out there for folks who are willing to search for them. There are tons of independent developers trying to do cool new things - myself included :)
I understand that, I think in the last 5 years or so, my excitement for games has diminished almost completely, maybe some day I will be able to be exited about games again. I don't like the direction that much of the game industry has taken. Failed kickstarter projects, and early access games are also responsible for my disinterest in most games nowadays, I like it best when a game is kept completely away from the public until it's near completion. Maybe it's becuase I'm older, but damn, I just don't care about gaming much anymore, I mostly play classic games now, or games made 8 to 10 years ago.