I can honestly say Season Unending is my favorite quest in the entire game. I'd even go so far to say it's probably one of my favorite missions to do in any game. I simply find it interesting to see the Thalmor, Blades, Empire, Stormcloaks, and the Greybeards all in one place, sitting around a table, and discussing truce. I also like the whole atmosphere of the 'political' discussion. I kind of wish there was more you could on it (like a longer discussion and more 'give some, lose some' choices).
What do you think of this quest? Do you love it, hate it, don't care for it? And why?