The thing that has disappointed me for the last couple of movies most was Hermione.

Yes she's pretty and smart and everything but the scenes I enjoy the most are the ones where she is passionate.

For example

When Ron and Harry make up after 1st task in GoF, she bursts into tears and says "You two are just so stupid!" That was Hermione at her most Real and most entertaining. But in the movie she just says "Boys" (total opportunity lost)

Also in OotP there is the bit between her and Ron which I always liked:

"Thanks Hermione, and if I'm ever mean to you again.."

"...then I'll know you're back to normal."

They said this in the movie but I almost missed it, they were sluffing it off so much.

I hope we see Hermione's heart on her sleeve more in the next films. It's really central to the charm of the books.