Unfortunately, due to the writers, Ron is no longer a fully-fleshed character, he's a caricature. And I'm completely not buying the explanation as to cutting down Tom's memories. The Gaunt family is one of the most essential elements in the entire septology. "Will the fans really like it if we lose that?" Well, you apparently haven't been contacting the ones who really should count in that question, and they are THE FANS!
I'm still at a loss as to how JK can sit back and watch her books being put into a food processor then spit back out into a garbled mess. Then again, she has her (our) money, maybe she doesn't really care anymore. Since POA was released, I haven't heard her say very much about any of the movies.