The "music", unquestionably, is great.

I'd rather that Gus had woken up at some point, realized "I am doing myself no favors following Woodrow around to his next mistake. I can do better than this." and had gone back to the woman that loved him and thereby saved what was left of his own life and potential.

He could have done it. He was capable of turning his life around. Woodrow wasn't.

I hate seeing people who are capable of rising above their own foolishness fail to do it. The one great foe anyone faces in life is their own foolishness. I'd rather see them conquer it than be conquered BY it. It's the central drama of human existence. It's the greatest challenge of our lives.