I believe you mean Jay Wilson? Dustin Browder's involvement with Diablo 3 was only from a Strike Team perspective. Browder is more known for his work on Starcraft 2.
Diablo 3's hardest difficulty at launch was a nightmare. You had to move around with Ninja Gaiden/Dark Souls-level precision in a game engine that just was _not_ designed to give you that much precise control
So often I'd be trying to run out of something, accidentally click a monster instead of a patch of open ground, and my guy would stop to turn around and shoot. It was horrible
Not only was it un-fun to play, it actively made me feel bad. "Hey, game's over, you're just not good enough to play any more Diablo. Get out."
This is the direction Path of Exile has gone and frankly it sucks. It more closely resembles bullet-hell games than old school Diablo 2.