I finally saw the third recently. I digged the parts in Davy Jones locker, but overall it was terribly over the top. They should have left the chinese out of it in my opinion, and the other pirate captains didn't seem to fit neither. Except that french one that looked rather dead and Sparrows dad. And Barbossa of course.
I was wholly disappointed by the third film. Nearly every new character was unnecessary and the progression of the story was weak. The second movie made such a big deal about getting Capt. Jack Sparrow back... sure was easy by the look of it. The first movie was the only good one in my opinion.