Two words: utterly ridiculous.
No, I'm not talking about the fact that there are people coming back from the dead, undying monkeys, or other such characters. I'm talking simply about the plot. You see, I thought the writers for this film would brilliantly tie together the hundreds of loose ends from the second movie ('Dead Man's Chest'), adding a dose of action and fun, to create the best film of the summer. I thought wrong.
There were plenty of laugh-out-loud funny parts, and there was very little objectionable material in the movie... so I guess 'At World's End' has that going for it. The problem is that there is way too much in the plot that didn't make any sense at all—not even a tiny bit. And I feel robbed of a few more precious minutes of my life because I stayed until the end of the credits to see the boring and non-informative scene the producers decided to stick in there.
Do yourself a favor and wait until the DVD comes out, then watch it (or don't) for a couple bucks. See a different movie in the theaters; one that has some sort of story line. (Might I recommend Ratatouille or Spider Man 3?).