Jar jar fits as a character IMO, he was just overused, he stole the focus of every scene. Grievous is worse, there is no character there. I agree that the PT broke the rules in a lot of places though. Sci-fi and fantasy, need something to ground the movie and reality and it wasn't there in the PT IMO. I also have no problem with the virgin birth. It's great symbolism IMO and it expresses Vader's character psychologically a little better. He never had a father which is one reason why is son is important to him.