The good news is that the same career that saw him entrusted with the “Guardians” films and the screenplays to the first two “Scooby-Doo” movies also saw him cutting his teeth working for the cheerfully sleazy Troma Films and then going on to work on such dark superhero satires as “The Specials” (2000) and “Super” (2010), in which the hero’s “superpower” was the ability to beat the heads of the bad guys in with a hammer.
The Specials, Super, and Guardians of the Galaxy broke new ground; while The Suicide Squad plays like a greatest hits of all three.
It seems like most of his thoughts on the foibles and limitations of the superhero genre were expended before it went supernova with the MCU, back when he was making satirical comedies like The Specials and Super (provocative, if not especially good).