"Redeemable" is a subjective concept anyway. In the eyes of god? His wife? Jesse? I think the ability to feel remorse, compassion, love, etc. shows that he's not a complete monster. That's all I'm saying. In my opinion, Gus and the cartel people were far worse. The most disgusting thing Walt did IMO, letting Jane die while watched, was arguably justified (in his mind) by his belief that she was dragging Jesse down with her into a pit of abuse, and the fact that she had already tried to blackmail him.