Imo knees are one of the only answers to guys who want to fight in a phone booth and mash the head movement button. They aren't very strong but I do find them effective to punish someone who only wants to stand nose to nose.
I don't think they are exploitable or op because of their range. If you are the one choosing to brawl in close quarters you're going to get hit by them, but if you want to move away they are easily avoided.

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