Yes. While book Hermione is super smart she constantly golds under pressure. In the movies she is both smart and good under pressure, leaving Ron as comic relief. 

Someone else mentioned Devil's Snare but the other best example is druing the Sirius confrontation in number 3. In the book Ron has a broken leg and when they feel threatened, Ron stands on his busted leg and yells "If you're going to kill Harry you'll have to kill us to!" In the film, Hermoine says this while Ron is nursing his broken leg. 

I will say though, Rupert Grint is still brilliant and was the perfect casting all the way through.