Games these days are...cliche. There's a lot of duplicates out there, and the problem is everyone thinks they're original by creating yet another FPS...except it all boils down to "bad guys pop up and you kill them". Chalk a lot of it up to us (really the people who grew up with the very first games that actually weren't **** - like Doom, Command & Conquer, Half Life, Freespace 2, etc) growing older and just getting tired with seeing the same stuff over and over again. If you think about it, there's a lot of kids out there who are just getting into gaming and they don't even have a conception of what games are like - Halo, COD, etc, are all "holy **** I've never seen this before" whereas for a lot of us we've seen it all done before. That doesn't necessarily mean either is bad (well, except for COD/Madden/Halo/Final Fantasy clones which are just basically reskinning the same game over and over again (also read: every single Japanese RPG) - THAT is frustrating), it just means that we have to find more interesting stuff. The problem is really that the game industry has been taken over by the mainstream, so most of the "big boys" only go for this massive market, whereas most of the indie crowd think, and I actually read this on a forum on Gamedev.net: "...indie games don't have the resources to do anything unique or creative, so I'm going to just do the best modern shooter I can".
Back when a lot of us were growing up, the overhead for what was considered a "good" game was a lot lower - it was more about the gameplay than the graphics. Since most people react to "pretty" more so than deep gameplay (especially on a console where the latter is extremely hard to do because of the limited controls), that's what everyone goes straight to when they think of what a "good" game is. Indie games are starting to make a resurgence, but again people just kind of don't do 3D unless they can do it super-duper amazing with normal maps/bump maps on every bead of sweat on each individual character's face - so all we get are boring platformers that are just REALLY old formulas recycled with an interesting twist (BRAID).
tl;dr; games aren't getting more boring, you're just getting older. Unfortunately no one out there is making unique stuff for us to enjoy because most of our generation is getting into the industry and instead of forming their own studios, they're going to work for the big ones because that's what college and parents and everyone older than them has told them that's what they need to do to be successful. I.e. if you don't come up with a million dollar idea in college you're doomed to work in whatever job your degree entitles you to for the rest of your life.
If you want to see more interesting games, make them yourself. You know what the best part is? All these younger folks today will be blown away by the older games. I showed my gf (freshman in college now) Freespace 2, and she was blown away by how complex it was and how good the voice acting was. That being said, the controls really are too complex and really are too stupid. Games are getting more streamlined and easier to understand when it comes to manipulating them - that doesn't mean the gameplay elements have to get simpler.