Angelus > The Mayor > Spike > The Trio > Glory > the rest
the Master sucked in season 1, but he's amazing in any other flashback or anything beyond that though.
Adam actually wasn't a bad idea, but he was so physically clunky that they couldn't actually do anything with him. I mean the actor is so layered in that costume that he can't even move. Hard to make him compelling when he's never involved in anything ever.
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The batman villians all seem to be one big joke that batman refuses to laugh at - SantaRPG