Just like Alexandar94 mentioned, the stamina and damage were just updated a few days ago, and honestly I think they’re in a much better place now.
If you’ve played since the update, it’s pretty noticeable that people can’t just throw endlessly without consequences anymore. Players who constantly spam punches and big combinations will burn themselves out pretty quickly if they aren’t managing their stamina properly.
The damage also feels more consistent than it did before. It’s obviously not perfect and there are still things that can be improved, but from what I’ve seen, the community has been pretty positive about the stamina changes, myself included.
I’m not sure when you last played, but if it was before the recent update, I’d definitely give it another try.