Just saw this today...and although it was okay...I didn't really like it all that much. Good special effects, some funny lines, lots of action, but...
I enjoyed the first Pirates very much, because I liked Captain Jack Sparrow. It seemed like he was always in control, and always had a plan that spared the innocent and punished the guilty.
I turned against him in Pirates II, when he quite cold-bloodedly set about recruiting 100 souls to give to Davy Jones, in return for his own. Sure,the men he recruited were for the most part old and decrepit...but they didn't deserve that fate, and the fact that Sparrow was willing to sacrifice them... no, I didn't care for it.
Pirates III has Sparrow almost back to his old self - he has plans for Will and it turns out Will and Elizabeth do trust him at the end...but it did seem that there was no elan in Depp's Sparrow, and although Geoffrey Rush's Barbossa had some good lines and some good deliveries, there were other times when he seemed to be walking through the role. I liked Kiera Knightly, but still don't see what she sees in Will Turner (it'd be interesting to see Depp and Orlando Bloom exchange roles, and see how Bloom handles the exuberance of Sparrow while Depp handles the staidness of Will Turner....who would be the most popular character then, I wonder...)
Admiral Norrington has only a few scenes in this movie...I definately felt sorry for him...yet another character who's part is written blandly...
As a connoisseur of movie sword fights, I wasn't impressed by the swordplay on hand here (not that there was very much of it) - although it wasn't quite as bad as the windmill fight of POTC II.
The climactic battle at the end had Miss Swan and Will Turner fighting together, back to back ala Mr and Mrs Smith (Jolie and Pitt), and it didn't work out quite as well, in my opinion, but it gave the chance for Barbossa to have one of the funniest lines in the movie.