As I explained at further length in a different thread, I like Westbrook's game, and he has a great future ahead of him, but he's one of the biggest ball-hogs to come along in a long time, and he's got to mature a little and learn the priorities of when to shoot and when to involve your team-mates, especially team-mates that are better shooters than you.
This entire playoff run by OKC has been filled with moments when Durant should have had the ball, but Russell refused to give it to him ... or anyone else, for that matter. He's got to get over it, because eventually the rest of his team will resent him, and the chemistry will break down. I think Durant needs to be a bit more of a leader as well, and talk to Westbrook about just this matter.