I'm as guilty of this as anybody else. But when we talk about who has the greatest Rogues Gallery, we always forget to mention Shang-Chi:
Click to embiggen to full glory. Do the same for the key below:
For what it's worth, that's not quite a complete listing. There's a number of henchmen (like Brynocki the cute killer robot), animals (like insane intelligent gorillas, giant killer turtles, sharks & leopards and crocodiles), and other deadly foes who have been left off.
But most importantly, they left off the most important villain of all:
Panorama of evil from Master Of Kung Fu #102 (1981)