Morrison's New X-Men is among my favorite runs on comics ever.
My point is that as soon as it was possible, editorial mandates walked back MOST of his controversial contributions in favor of nostalgia. Things that remained: Xavier's becoming an actual school with an actual student body, Jean Grey died and largely remained that way, and Emma Frost become a central member of the team(s). I HOPE that future WW writers can polish the coals enough to find the very few gems in the run: the demigod origin, the Firstborn enemy, Eris's whole presentation, and Ares' exhausted and forlorn demeanor.
I haven't yet picked up the Rebirth special, but it sounds like Rucka is committing the first sin already and making his case rather than just jumping in the action and having us along for the ride.