I also think handwriting a letter will have more impact than an e-mail. It shows you care enough to put a lot of effort into expressing your disappointment. I bet with an e-mail you will just get a generic "we're sorry you're disappointed but we hope you will grow to like Elizabeth after you see her" blah blah blah. I don't know what kind of a response you'd get from an actual letter, but from what I've heard companies do take handwritten comments more seriously. Don't quote me on that, though...