Curse MK is so delightful because like, as I've mentioned before he functions as a mirror to MK, and that gives us the opportunity to have some out loud introspection. He forces MK to emphatically admit insecurities and even reveals to the audience some insecurities that wouldn't have been voiced otherwise:

"We're just like Wukong, a fraud! A trickster! Destructive! Why would our legacy be any different?"

You wouldn't EVER catch MK admitting his doubts about Wukong out loud like that, but that's fine because we have our buddy the curse to do it for him. I love it so much.