He is what we should have got with Lex, where the film was about the villain not being able to take on the avengers because he would lose, but planting the seeds in the shadows which would see the hero's turn on each other, because the villain went out of his way to not be a face he did what Loki failed to do in the avengers by ripping them apart, Ultron opened up the wounds of avengers downfall, zemo continues where ultron left off. That was the thing with zemo, he was a chess piece villain that went out of his way by not standing out, but quietly plant the sees and that is a good villain. This was a very refreshing villain, while snyder rammed lex down our throats Justin Hammer style, zemo never overshadowed the film, and his plan was driving the film where it goes from everyone signing an agreement, to all out war between the hero's. I heard a few complaints about him, I think without zemo I don't think the avengers fighting would have had the payoff we got.