I just came from the premiere of PotC in our local extremely crappy theater.
I found PotC: DMC to be a good sequel, and it featured a very good cliffhanger. I admit that the movie had several bad scenes where nothing really happened, but in contrast it had a lot of great scenes with lots of action.
I give it 3.5/5
Now I'll go back waiting for the Superman premiere, two weeks anymore. Oh man, that is going to be one sweet adventure.