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.
YMMV: Generation X
Bizarro Episode: The storyline in the 30s where the M twins and Emplate merged into a single entity and pursued some pandimensional MacGuffin that turned out to be a Barrier Maiden. The team chased them on a cartoonish train with help from a talking rabbit. The storyline began with an attempt to explain the St. Croix family secrets, but quickly veered off into Alice in Wonderland territory.
Complete Monster: Johnston Coffin, featured in four obscure issues of Generation X, is wanted by S.H.I.E.L.D. for crimes against humanity, but instead somehow finds himself employed by the US Government. With the government's blessing, he builds a Hellhole Prison where he "fixes" disobedient teenagers, many of which had only said or thought something disobedient. What really puts him over the line, though, are his "Special Children" - kids from his first Hellhole Prison in the '70s, whom he's wired up to huge cyborg bodies and uses as security. They've been that way so long, it's implied in perpetual agony, that their bodies have actually begun to rot. He also has half a human mounted on his wall, is implied to be a rapist, and carries around the skull of a child he shot in the head everywhere he goes.
Franchise Original Sin: Aimlessness. A majority of the time, the book had no solid plot plans or even a solid idea of what the characters were doing. For the first half of the series, this wasn't so bad because the character-based plots and interactions held everything together. As it went on, the good parts fell away one by one, and the lack of a solid direction to go into left the writers floundering and the readers annoyed.
Jumping the Shark: Most readers tend to agree that the "resolution" of the M/Emplate/Penance plotline during Larry Hama's runnote Penance was the real Monet, having been turned into Penance for making fun of Emplate, while Nicole and Claudette were merely impersonating Monet. Scott Lobdell originally meant to have Penance by a Yugoslavian girl named Yvette and for there to be no real Monet, merely the twins. hurt the book so bad that it never recovered.
Nightmare Fuel: Everything about Johnston Coffin. His men can come for you at any time, simply for doing something like insulting the school principal, he'll lock you up for the rest of your life, and if he gets you, having your head squashed like a grape is only the second-worst thing that can happen to you. Oh, and he claims to be an abstract concept in human form, so it's entirely possible he's unkillable. He may just be a powerful mutant, though.
Romantic Plot Tumor: Chamber and Husk's on-and-off-but-was-never-really-on-to-begin-with relationship. Chamber's Wangst and the Token Minority Couple feel of it (they were the only white students) certainly didn't help either. Even worse was when the series ended and the arguing carried into Uncanny X-Men at the most inappropriate moments, such as the team's fight against Alpha Flight.