I would like to know your opinion on certain antagonists of the show, but here’s mine.
Krazy-8: Not the most memorable, but still serves a purpose. He helps set up the theme of the series and is the beginning of Walt’s descend into darkness.
Tuco Salamanca: I really like the upbeat energy his actor gave the character. You could seriously sense a raged and emotional psychotic crime boss whenever he’s around.
The Cousins: They are perhaps the most cold and silent antagonists in the series. They are just so menacing at any scene and I like how the relate to family as well.
Gus Fring: Perhaps the best one of them all. He’s not exactly menacing, but you do get the sense of someone who is invincible and multiple steps ahead of things. He also has a bit of similarities to Walt.
Mike Ehrmantraut: He’s really a badass character. I’m not one to see him as much as a villain but rather an anti-hero, who serves for his family like many others. Not to mention, he’s kinda like a Tritagonist for Season 5A.
Jack Welker: The most evil of them all. He and Todd are just so despicable that their deaths were satisfying. Also, my problem with him is that he seems a bit like a random choice for a final boss.