I really liked the Ron and Hermione relationship in the books. It didn't work in the films because Hermione was too pretty and Ron a bit too laid back. He looked much keener than her, I wasn't convinced.
In the books they are more evenly matched. She outshines him in ability but is not as generally likeable and sociable, She lacks imagination at times and can be a little negative. Remember Ron can be quite amusing and he does get attention from Lavender which suggests that he isn't necessarily less physically attractive than she is.
Am I the only one here that isn't missing the fact that Hermoine was "made" beautiful by JK by the time the Book 4 Triwizard Yule Ball came around. When Draco hexed Hermoine so her teeth grew even larger than normal, she didn#t just get them fixed. she had them shrunk to regular for want of a better size, even though it was a while before her friends noticed. Remember that moment in the book and movie when Harry notices Hermoine in her dress ansd his jaw drops?
I know Emma Watson never had Hermoine's original appearance but for me it proves she was just as right for the role as anyone else.