The Souls games are resource intensive games. They have been since Demon's Souls, they do a lot of things other games mask or don't even attempt.
There's a lot more going on than what's immediately on the screen.
EDIT: Compare the visuals of Dark Souls 1 and 2 to AAA budget RPG's like Fable 3, Dragon Age 2 or Dragon's Dogma. The only one that even compares in scope is Dragon's Dogma, and the IQ in that game is much worse than either DS1 or 2. As disappointing as the downgrade is, what FROM is pulling off on these machines is still remarkable.
*eats crow* will eat it gladly since I probably learned something