Shutter was not a Dudder
I actually liked this movie. Yes it's someone predictable, but so are 99% of the movies out there. The premis was interesting, but could have been better. Shutter has a very similar theme to The Grudge (but not as good). In order of movies, I would say The Ring > The Grudge > Shutter.
Good points: The leads were decent (Joshua Jackson & Rachel Taylor) and the ending was satisfying. The main ghost (played by Megumi Tanaka) was a good choice, but I wanted more surreal effects to go with her look.
Week points: Relatively poor plot development. Lack of creepy "Ring-like" jerky movement; the ghost made too many natural "human" kinds of movements.
All in all, I would give this movie a C+ and say it's worth the price of a matinee ticket, just don't set your expectations way up there.