Okay. So the movie was entertaining. It's tough, but I have to admit to that. That said, the movie was still extremely flawed, and I can't say as I like it as much as Curse of the Black Pearl.
First, the plot was so confounding that I felt like I was playing a board game. Seriously. You know how when you're playing Monopoly with the family, there's always that stickler to rules who says, "You can't sell your Get Out Of Jail Free Card for fifty bucks! It says so right here on the box cover!" That's what it felt like watching At World's End. "You can't elect Elizabeth Swan! That's against the rules!"
Secondly, there's the fact that this third installment doesn't exist without the second installment. If I had it my way, I would have taken all the plot-driven elements of Dead Man's Chest (about 20 minutes of screen time) and thrown them at the beginning of At World's End. It would have made both movies better.
Still, the special effects were terrific. The acting was decent (though it seems like Depp may be getting tired of the Jack Sparrow routine). The maelstrom scene at the end was pretty cool. I wish they hadn't brought the god Calypso into it. That's Greek and we're discussing the Caribbean islands.
If you're a fan of the series and you easily buy into the convoluted storylines, you'll probably like this one more than I did.