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.
In fact it was executive meddling that kept her from returning until they found a way (Madelyne Pryor was even supposed to be Jean reincarnated until that was nixed).
The second series contains examples of:
My Real Daddy: Peter David is the man behind both the second and third series, and the title's name is now always linked to him.
Rescued from the Scrappy Heap - Madrox, who annoyed writers and artists alike for starting life as a visually boring and bland character whose superpower was to create visually boring copies of himself. It took Peter David's addition of creatively using his powers, a sense of humor and a philosophical side for the character to take off, and even after that, most writers still don't know what to do with him.
Die for Our Ship: Some fans of Rictor/Shatterstar REALLY hate Rahne, especially after she tells Rictor he's the father of her baby.
She never specifically stated he was the father, he just assumed. Mind you, she encouraged that assumption because she had religious problems with his relationship with Shatterstar and was trying to Cure Your Gays.
God-Mode Sue /Mary Tzu: Layla, especially at the beginning. She knows everything everyone is going to do, outwits every enemy, pulls multiple gambits and eventually it turns out it was all thanks to memory uploading by her future self and her REAL power is ressurrection. While much of it can be explained by her knowledge of the future allowing her to prepare for a given situation, sometimes it seems the world simply works in her favor, most egregious example is satellite just happening to fall at the fence of the prison she was held in, allowing her to escape. Her dickish attitude doesn't help.