Actually, i have found fortresses in DKS super easy(and whole DKS as well), to the point that i am considering reinstalling original D2 and buying FOV for it.
(Not sure if it's spoiler or not):
They appeared much smaller with much less mobs and almost non-existent AD barriers(i think there is only very few in total),and i haven't had any challenge in clearing them out.At the same time i had no need to pull them out of structures.(i was playing on Hard difficulty)
While i really like XP rebalancing and new armor placement, i am rather very disappointed with fortress thing.