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.
Rescued from the Scrappy Heap: Azazel in the comics was a weird villain with a nonsensical plot in a poorly-written arc that most fans have banished to the dark realms of Discontinuity Land. In this fanfic, he is a legitimately cunning, terrifying, manipulative bastard who is based on angels from Enochian and Christian mysticism rather than the typical Marvel and Lowest Cosmic Denominator demons.
Some Anvils Need to Be Dropped: Prejudice is wrong, you aren’t evil unless you choose to be, and don’t be ashamed of who you are. The same necessary anvils X-Men was created to drop in the first place.
Tear Jerker: Nearly all of the Traumatic Incident chapters. Traumatic Incident Number 2 isn’t tear jerking at all, but it makes up for it by introducing the man who will be the Big Bad: Azazel. Chapters 49/48-54/53.
The Woobie: Kurt, most definitely. But most of the main cast gets their moment of woobiedom.