These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Broken Base: The Spacebattles forum inevitably gets horribly heated whenever the topic of the fic is brought up. Some love it, some despise it, all have incredibly strong opinions on it. Fim Fic users also have strong opinions on the story, but are far less vocal about it.
Jerkass Woobie: Each of the mares in the COMBS arc, to varying degrees of reader sympathy.
Rarity and Silversteel cross into this after their treatment of DJ's family during their reunion with her. Rarity has been considerably more persistent about the "Jerkass", part, while Silversteel has begun to make amends with them.
Magnificent Harridelle: Champagne Dreams a.k.a. Sunset Shimmer. There is nothing that she won't do to protect her family, even destroying every other family on the planet.
Meaningful Name: During the Christmas special, we are introduced to Mike's cousin Joe and his wife Mary. While their personalities are well different, the names may reflect that of Joseph and Mary, two figures central to the Christian Christmas mythos.