User blog comment:Ironman444/Apocalypse,Ultron,Thanos who is the ultimate villain among these three/@comment-3406131-20130310222848

Ultron is the deadliest of them, the most difficult to erase (even if the three of them have different "resurrection" capabilities).

As a pro-mutant, I don't really believe Apocalypse to be that bad. Some of his interventions were intending to help his species as the X-Men do, but yeah, not a good guy. And he is often beat up by the X-Men.

Thanos: A big purple teddy bear with a skrull chin and stuffed with love for Death. And also a part-time philanthropic guy (remember Rigel III, never forget) Sorry but this guy isn't really a bad bad guy. (And also, he had a terrible childhood)

I have never seen Ultron being truly defeated, even if he made often childish mistakes (I haven't read all of the issues also..)

For Magneto or Doctor Doom, I had always see them as something else than villains. Their actions and story make them more neutral. Seeing them around a table with Red Skull made me uncomfortable, even with the offensive conversation they had then.