I'm here to kick ass and maintain a list of the anime series I've watched... and I'm all out of ass.
I like my anime to be convincing and interesting the whole way through. I've seen a lot of stuff; some ideas got old and boring to me since they are pretty overused.
Here is a list of things I believe to be cancerous (and, unfortunately, quite common) to anime/manga:
-Chibi or cardboard cutout scenes with extremely blatant "humour".
-Silly or idiotic music that plays while characters are saying or doing something intended to be funny. Give us a little credit, we can tell when something's meant to be funny without some music to emphasize "That's the joke, now laugh!".
-Female characters having huge, jiggly breasts, dressing scantily, posing provocatively, revealing panties, being ecchi, being moe, being sluts, etc. This adds nothing to the story or overall work and just cheapens it.
-Rape or other violation. Honestly, who thought it was a good idea to put that in anime/manga? It is not interesting nor entertaining. It is just porn.
-Harems. Come on, it's so overdone that people consider it a genre of its own.
-"Symbolic" stuff that has been recycled hundreds of times over, such as thunderstorms when a character dies or a flickering flame on a candle that blows out.
-When characters have the exact same conversation/smalltalk I've already heard dozens of times in other anime.
-Storylines so weak they barely exist or seem like they were just made up on the spot by an idiot.
-Even serious anime often has weak humour and/or perverted fan service thrown in.
I'm in despair! This world where anime/manga is an ocean of piss has left me in despair!