Well, so far, the list of movies I've seen in 2007 (that I can remember seeing)

goes something like this:
300
Harry Potter and the OOtP
SpiderMan 3
Transformers
Grindhouse
Ghost Rider
Of these, Spiderman 3 and Ghost Rider were the best, Transformers was also good. IMO The most disappointing for me is Harry Potter and the OOtP. They left out too many little details, altered some of the scenes and how do you make the longest/biggest book in the series the shortest movie? Especially when the first two books were smaller and they each were 2 hours and 40 minute movies?
Grindhouse was also not as good as I thought or hoped it would be, though the first movie was pretty good and the fake movie trailers were funny.