I agree with this sentiment. I'm savoring Lord Ewing's final courses and having a smoke. This thing's a wrap.
While underwritten, I do think Frenzy's course from super mean killer villain to diplomat to hero is basically reasonable(she kept that AoX timeline in her memory), especially considering the leaps and bounds a character like Emma took to become a premiere X-Man.
Remember when Jean telepathically forced Frenzy(so, who's judging whose ethics and morality?) into joining her ragtag team of X-Men to stop Magneto who was about to take over the earth with an army of newly Legacy Virus-cured Genoshan mutates and additional mutants numbering about 100,000(which basically amounted to Jean telepathically tricking Magneto into a false scenario long enough for Logan to stab him in the back)? Right before the Morrison era. You could say Frenzy's arc begins at least there, but actually think back to the fall of Avalon itself a few years before, when Scott led the surviving Acolytes to the Outback town the X-Men used to live in, and she shows support for him even then in X-Men 44.
You all seem to forget that Emma literally fled the country under duress after having killed a police officer who was investigating her for missing assets from her sister(who she had indeed murdered and stolen her wealth after the explosion at the school which killed Everett).
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All the Generation X kids were afraid of her(and disillusioned with Sean, who was reeling from the death of Moira) and bounced just before she herself fled. So the question posed at the beginning of Generation X: "Can we trust Emma?" was answered in the final pages of that book as "No, we can't. Then she immediately is shown surviving the death of her Genoshan students and joins the team from jump, basically no questions asked. "I was on drugs and alcohol." was her excuse for any previous behaviors. So no, she didn't really earn it either, she was given a spot and huge narrative focus within the franchise immediately. Joanna hasn't had that privilege.
I'm not saying Frenzy's storyline has been perfect or that she's been well developed even, but at this point, the X-Men really don't have much high ground to stand on in terms of morality. Xavier is dark AF. Beast is a war criminal of the highest order. Angel is Death. Jean kills whole solar systems and timelines as Phoenix. Cyke had his moments. Iceman froze the whole world that one time. And those are just the originals, never mind Wolverine aka century+ of serial killing. Actions in the moment are either maleficent or beneficent. And they can vary moment to moment, perspective to perspective. It's just stories in the end. Characters don't earn anything. They are just written. It's either fun or not, but beauty is ever in the eye of the beholder.