I found that performance pretty standard for her, I mean she was the best on Utada United (not to count Keep Tryin' which was pretty bad) but she never quite reached that level before or after. I was expecting something much more horrid but she was never great live (strange because I don't believe she's stressed after all these years and when she sings bits and pieces of songs in interviews it sounds okay)...
That Ringo letter is kinda rude but if she gets it, I think she'd be pleased