I'll start off with what I didn't like:
In response to you (Deman):
Jack technically didn't "sacrifice" himself. Elizabeth did THAT for him. Probably for the reason that, since Jack left Will for dead, she left HIM for dead. Notice he tried to escape, he had no intention of going down with the ship. He's got some honor, but not that much. He only charged the Kraken because he knew at that point that he was doomed and he'd rather fight the thing like his style suggests than try to run, get snagged by one of the numerous tentacles surrounding all sides of the ship and get slurped.
Secondly, they can't NOT have Jack in the next film. He's the moneymaker of this series. People care a LOT less about Will and Elizabeth. Besides, in my opinion, the more plot, the longer the film, the better. I have no trouble keeping track of numerous plotpoints, and it only makes it more satisfying when a piece of plot we overlooked most of the film comes back at the end to bite us all in the ass.
I can't wait for the third one, and I like it just as it is.
Oh, and by the way...what will you bet that the creepy psychic lady is Jones' long lost heartbreak-er...rip...?
Savvy...?