I don't hate Elizabeth for what she did. Granted, she could have been nicer and less sneaky about it, but she basically had two options. She could let Jack come with them and doom them all (since the Kraken was, indeed, after him alone), or she could leave him to die and save the lives of the remaining few. I honestly don't know what I'd do in her position, but what she did took tremendous courage and willpower. From the look on her face, she wasn't telling the truth when she said, "I'm not sorry." She's in a worse position mentally than any of the other characters because she's suddenly questioning who she is. All of her life, she's done what's right and always considered herself to be a good person, and now she's responsible for the death of a friend. What's more, she willingly tricked him and made the conscious decision to chain him to that mast, then lied about it to the others. His last thing to say to her was, "Pirate," and I think that really shook her up. Regardless of how good-looking and occasionally moral they can be, pirates are nonetheless a horrible group of people. They are self-centered, generally immoral, and ruthless enough to do whatever is necessary to get what they want. Suddenly, she sees that in herself, and she's scared. What if she's not the good person she thought she was? Does this change everything? Even though it was a very, very rough draft (hardly even enough to be considered an indicator of the script), one of my favorite lines in that early script of PotC 3 was Elizabeth telling Will that she didn't deserve him. She feels horrible about herself and needs a way to redeem herself in her own eyes. That's why they're setting out to save Jack in the third one. She has to prove to herself that she's still a good person.

Yeah, chain him to the ship, but must you make out so heavily?

Let's keep this discussion to PotC 3, aye? Likes and dislikes about DMC would be better suited for its respective thread.