Ron did the chess thing in both the books and movies. Without him, Harry and Hermione would be dead. In both things he has a point even if it’s only to play chess.
He was pretty important to the story, plus if he wasn't there Hermione probably would have dated Harry or Viktor and Ginny would be heartbroken (I don't know who married Viktor)
Okay, I guess what I'm trying to say, is that I'm conflicted about him. Because on one hand, he's a cool guy and I like him and 100% ship Romonie, but on the other hand, I don't really like him and he didn't really do that much...