Unfortunately, the MCU is definitely its own beast in many ways. All that multiverse jazz, which DC is toying around with too. Yondu was a time traveler and the founder of the Guardians in the books. But in the movie, yeah, he was just a marauder. They definitely made some changes there for the sake of the story. But overall the characterization of the characters was generally what you'd expect from someone that understood how to write for them.

But yeah, without dead pool at the time. There definitely was no way of getting book accurate infinity war etc.