A lot of the "old games were better" is because we mainly remember the best of the best. There has always been shovelware.
On the other hand, I do agree that AAA gaming is fairly stale. I believe it's mainly because the games are huge investments that have to be a "safe" bet, which is one way to make art (of any type) boring.
But there are indie studios making amazing games these days, because the incentive there is to differentiate their product from the others. Once an idea gets popular enough, AAA studios will pick it up and grind it into the dirt.
I would disagree with the idea that games are worse now. I think the best stuff is getting made today, it's just harder to find it in a deluge of shovelware. Look in the indie and AA space for interesting games.