Sometimes I get the impression that when westerners say "western games are FRESH DAWG not like old moldy Japanese crap" they're mainly impressed by presentation. Western games have become synonymous with vast budgets and hollywood productions, decide to wow people with slick presentation and movie-like visual experience.
But if you tear games down to their component parts, and get into design, it's not so easy. The biggest western franchises, like Elder Scrolls, are still basically the same thing as Morrowind from 8 years ago; just with better graphics and as some hardcore players would say, even dumbed down. Stuff like Uncharted is basically a third person shooter / traversal game that happens to have amazing graphics and streaming presentation.
Western games also focus heavily these days on "PUSH A TO AWESOME". That is, making sure the player is floating in a smooth, edge-free environment that rewards every interaction with something awesome, so as not to scare away or bore what is actually a targeted audience of very casual 20-somethings. Guys who get pissed off if the game fights back and makes them lose.
It's a very dicey thing to try and get on a high horse and chortle about how western games are made of infinite awesome and Japanese games are poopysticks. Because there's a lot of trends in western games that are not good from a real game designer's perspective, and from the perspective of hardcore gamers. But western games are merely very, very good at appealing to the sensibilities of casual western gamers this generation.
But does being good at appealing to sensibilities of one audience mean they're objectively "better"? Is chocolate ice cream superior to strawberry just because it's marketed to people who like chocolate? That's subjective.
The truly innovative western games this gen, I would venture, are as rare as truly innovative Japanese games. They exist in equally rare quantities. The main difference between East and West the last five years is that western developers were better (and better funded) at Dat Gloss.
But is surface gloss really the only barometer of how good games are?