I was also really disappointed. Firstly, there were just so many icky moments. Bill's first appearance, I think that someone's intestines were spilled on the deck during a fight scene and Jack BITING SOMEONE'S SEVERED TOE. Cries of disgust were aplenty.
Secondly, I have to agree that the comedy was overused. I liked the return of the two formerly undead pirates from the first movie, because I find them hilarious. Hee, the debate on the pronunciation of 'kraken' and what they want most in the world. That's the kind of low-key-ish comedy that worked in the first one, but what was with the Spinning Mousewheel of Motion Sickness and Doom? It seemed extremely unnecessary to me. But I may also be prejudiced against it because it did make me feel sick.
Oh! I just remembered a bit I did like! Elizabeth marionetting the dress. Twas funny. But I hated the way they edited the movie. The stupid ghost-dress-floats-hauntingly-down-into-depths-of-ocean 'transition' was so pointless it made me want to scream.
There was a reviewer who summed up my feelings about this movie thusly: About three quarters of the way in, you realise that this is a two and a half hour trailer for another movie which, by now, you no longer want to see.
Or something like that. I can't find the review. lesigh.