Along the same line of thought as the last post, my rule of thumb for romantic comedy animes is this: the average maturity level of the fandom is inversely proportional to the amount of skin shown by female characters in the anime.
For example, compare Nisekoi and Haganai. Both are harem-type romantic comedies that are significantly more well-written than average, both possessing some level of literary merit. However, while the Nisekoi fandom is relatively sane (perhaps because Nisekoi is pretty sfw), the Haganai fandom does nothing but argue about which characters they hate more and make an absurd amount of nsfw artwork. You wouldn’t think such a thing would happen, since Haganai is a genuinely quality show that contains a lot of deep, appreciable themes and complex characters. But here’s the thing: it also occasionally gets kinda suggestive. And that’s apparently all it takes for the fandom to be made up of 14-year-olds avidly discussing how much they want to bang [certain character] and how all other characters are worthless trash. It’s so silly, especially when you look at Nisekoi and see how another genuinely-well-written harem anime can have a mature, peaceful fandom.