I absolutely hated the Susan/Caspian relationship.
Having read all the books, it makes no sense! And I get that they're trying to appeal to the teenage girl demographic or whatever, and I know the movie can't always be the same as the book, but really?
Susan/Caspian... it just wasn't at all necessary.
But that of course is just my opinion. Maybe it's just because I'm not that big a fan of romance, even if I am completely in love with Peter and Edmund.
But I love love love Narnia, as does my mom.
I think they did pretty well on the third movie.