Glad I'm not alone in being disappointed. Several things stuck out at me right away (and I went to see it with lashings of dark rum in my gullet):
1. If it's good once, let's beat it to death. For example, "Why have just one big circular thing rolling down a hillside with people inside when we can have TWO DIFFERENT big circular things roll down TWO DIFFERENT hillsides with people inside them". And how about "If big, computer-generated tentacles were scary once, they'll be just as scary the next few times, after the audience knows exactly what to expect..."
2. Keira Knightly is a pretty little thing, but why must she be a whirling cuisinart of death in every one of her films? She is the size of an 8 year old boy, yet she kills more natives than smallpox or bad whiskey. I didn't see her in her recent Jane Austen film, but I assume that she hacked all of her suitors to death with a Stilton spreader.
3. Does anyone else find his or her flesh crawling when multi-bazillionaires use their films to lecture us that the REAL villains are big corporations? Who releases Jerry Bruckheimer's films, a small mom-and-pop co-op? Find another villain. How about the Spaniards? Nobody has picked on them in quite a while.
Well, this won't be a popular viewpoint, but pirates never crave popularity.