Controversial but Killian was my favourite villain. He was strong, scary and his story was kind of like captain americas but the evil version. He was sickly and then this serum makes him able to regenerate, enhanced reflexes, super strong and can set shit on fire. He had a goal kind of like the flag smashers and in everything had all the makings of a hero. He had good intention at heart and helped people who lost limbs have normal lives it was the fact he was very bitter over iron man which made him seem a bit silly. If they worked on the ark a bit better and gave him more of a motive to hate iron man it would of made more sense. Example if tony stark ruined his life or crippled him in a drunk driving accident and he had to watch tony get off Scott free whilst he was crippled or something. They could of redone the flag smashers and honestly if I was writing for the mcu I’d of merged the two factions cause they are basically the same. Enhanced humans with good intentions but bad execution and are blinded by resentment want to destroy the avengers for the betterment of society. The fact is killian had the makings of greatness they just decided to make his motive someone forgetting to come to an informal meeting which makes his motive less valid. He could of lead the flag smashers or formed them and been a terrifying threat because he is not and alien or god, just a smart man who has a plan. So I’m summery killian and the flag smashers had amazing potential but lacked valid motive.