Re: Let The Hero Lose.
Iron Man should lose one since going gung-ho against the grain when he believes he is right and then later having a "Oh, maybe I really shouldn't have done that" moment is so in line with what his character has always been about....being human and making mistakes(sometimes really big ones). Just incorporate that into a villain winning against him for once.
So long Harry Potter. The MCU is now the biggest franchise in history domestic AND WW. You're next, Pixar. $841m to go WW for you.