This movie did not live up to my expectations. There were some decent action scenes, but that was about it. Everything else seemed to be hashed out and a cookie cutter of what we expect. The movie didn't really attempt to do anything different except for show us the personal side of Ethan Hunt and get all lovey-dovey with his relationship. Really, it feels like they went out and made this movie in about one week. Everything just sort of felt like it was "been there, done that" territory. Remember the suspense of breaking into Langley Headquarters from the first Mission Impossible? In #3 that suspense was never re-created. This time, they break into the Vatican. The suspense is not there and too much falls into place for the characters.
Anyway, this is just a decent movie. The love story and a lack of suspense and innovation keep this movie from being really cool. Although, it definitely beats the pants off of the slow motion crap fest that was Mission Impossible 2.