Author's Saving Throw: When Rob Liefeld quit the title, Fabian Nicieza famously salvaged the team by writing out Cable and bringing exiled New Mutants Sunspot and Rictor back to the team, as well as New Mutants supporting cast member Lila Cheney, as well as shifting the tone away from the grim and gritty to focus on team interaction amongst the core New Mutants holdovers. Furthermore, Cable came back to the team, less angsty and more stern but lovable father figure-like, Feral was written out, and Shatterstar was given a crush on Rictor that gave him more depth than being a generic warrior dude.
Dork Age: Jeph Loeb's run features X-Force suddenly abandoning their hard-line independent stance, moving back to the Xavier Mansion and effectively becoming the X-Men's junior squad. Cable regresses back to being a controlling uncommunicative jackass; Cannonball is "promoted" to the X-Men, where he was characterised as the naive neophyte; Shatterstar's backstory is screwed up with a subplot about the mystery of his true identity, which was resolved so confusingly that even Marvel editorial couldn't make sense of it (if the series' letters columns were any indication). John Francis Moore's run contains several not-so-subtle jabs at how dumb a lot of the creative decisions from this period were.
Ensemble Dark Horse: Clarice Ferguson/Blink. Blink gained quite a fan following after a fairly short-lived existence in their mainstream storylines. She (or rather, her Alternate Continuity counterpart) got an upgraded role in the Age of Apocalypse storyline. She was so popular that she survived the destruction of that universe and became a main character in the Exiles spinoff (though it took five years).