The Thalmor DLC will be boring, unless we can join them and kill everyone or if we can destroy the Thalmor using the same methods they use against people! We need some more darkness in the Elder Scrolls. None of this heroic nonsense.
I agree with you on the part that we need more darkness, but i prefer to be the hero that faces the darkness. Its why i like Bethesda cause they catter to both groups, those that like to be evil, and those that like to be good.
The problem i see with siding with the Thalmor, as much as im for it, is lore. Ussually whoever you side with succedes at there goal, if the Thalmor win, its a complete lore change than if the Empire won.