I've always felt like Complete Monster is inherently an objective trope -- or at least as objective as any trope can be given that we're talking about fiction. Is a character devoid of any good moral character in the context of the work's own setting. As with every other trope there are edge cases, but I think that's pretty clear. We don't base it on our own personal morality, because that varies from person to person.
So far as I'm concerned, the only reason it's marked YMMV is because of these "wonks" we get who like to use it to talk about how cool a villain is.
So far as I'm concerned, the only reason it's marked YMMV is because of these "wonks" we get who like to use it to talk about how cool a villain is.
"Kitto daijoubu da yo." - Sakura Kinomoto