I've noticed what is, for me at least, a strange trend. The most that I found most boring over the last few years were, paradoxically, nearly all action films. Those are the movies that are supposed to be exciting, but a lot of them have had nearly the opposite effect on me. I think it's because the modern action film genre itself has changed from big-scale epic stories (i.e.: Raiders of the Lost Ark and Star Wars) to ear-splitting video games where the players (those of us who sit in the theater) have no control over the game play. In movies like King Kong (the Peter Jackson version), Pirates of the Caribbean II and III, and Transformers, the action scenes are too long and repetitious, crossing over the excitement threshold and back into dullness. It doesn't help that the directors don't seem to know how to shoot a scene anymore (Transformers was especially guilty of this; was there one scene in that movie where it didn't look like the cameraman was having a grand mal seizure?). There are still some bright lights out there; Forbidden Kingdom didn't fall into the trap of trying too hard to be a bigger spectacle than everything else, and just tried to tell a good story. But these movies seem to be coming fewer and farther between, and as long as hucksters like Michael Bay continue to be the "in-demand" talents in Hollywood, things will get worse before they get better.
"The object of life is not to be on the side of the majority, but to escape finding oneself in the ranks of the insane." Marcus Aurelius