There is nothing that lies beyond the breaking point of emotion. A breaking point is a climax. There is nothing above that limit. Hulk has a limit, and I don't care if in canon writers state that there is no limit to his power, because even lazy writers write canon stories.

As far as Batman goes, he's smart. He's defeated Superman so many times because he's paranoid and always carries Kryptonite with him. He defeated Darkseid without throwing a punch because he's good at thinking on his feet. He can defeat the entire Justice League with ease because he always has a plan. The entire point of Batman is that you don't have to have superpowers to be the most powerful man on earth. All you need is a brain and a plan. Any abilities that anybody has are completely meaningless if you don't give them the chance to use them.