Honestly? I don't think Doom is that big of a character that he needs to be an avengers level threat ESPECIALLY in the cinematic universe. His plot armor is why he is so dangerous, and very much he is just overblown. I'd rather see Kang, or superskrulls. Villains who are very dangerous and not just because writer's have raging hard-ons for them that they have to handwave Everytime he gets beat
My man.. HELL YEAH he should be in there. Manga do a damn good job with character development and having a manga of BP? Iiiisht we talk about wanting feats.. manga put superhero comics to shame in terms of feats