I rewatched some of it. Rogue's awesome, Nightcrawler's awesome, and Cyclops for once isn't an absolute dick.
But what really sets it apart for me is that even though it got cancelled (Muh Dark Phoenix Nooooo), that final picture of Xavier's Academy and all the students makes something abundantly clear: Jean didn't make it. Jean fucking died. They failed. It's such a little sucker punch hidden in a tiny thing. It makes me fascinated to think how they would've handled it.
Also, I like the Wolverine costume.