In many ways, Pirates 3 (subtitled At World’s End) is a better movie than the second one. It puts more weight on story and character development. It also takes itself slightly more seriously; after all, it is the end of a trilogy.
Personally, however, I never went to see the Pirates movies solely for their gripping storyline. I went to see the battles, the pirate coves, the leviathan sea monsters and odd mythical Caribbean locations we all remember from the Monkey Island games. Based on this, I actually preferred the lighter spirit of Dead Man’s Chest. Three stars is not bad, it’s just not great either.