It's a weird deal alright, this decade. There are some films that I absolutely love as much as any of the films I have in my collection, and they moved me just as much. That said, like CO, I only own 5. It seems that I've really loved a few films this decade, but had little interest in going to see several of the "must see" films.
I also think it's weird how so few of the films I've really enjoyed this decade have had the staying power (to me as a fan) that films from the 60s, 70s, and 80s had. Each decade seemed harder for me to come up with ten that I still loved.
It would seem to me that it can't be the art of film making that's at the root because there are things being done now that are so real that we don't always know when we're seeing CGI, truly incredible things. My guess is that it has something more to do with age. Maybe we're less likely to accept new trusted companions as we grow older. Maybe we can't be moved at the same level we were when we were young, at least not where films are concerned.