I really dont understand the issue with difficulty and I really think its people not understanding the new mechanics. It's challenging but on NG it's no where close to what people are saying.
I really cant find any flaws save from realistic constraints. As in, it's biggest flaw so far is that some pick ups are disappointing, but considering there are thousands of pick ups it's not really feasible to expect every item to be a weapon or spell.
All in all, this DLC is everything the game was but more polished. I love it, even more then I loved the base game. 9.5/10