It wasn't really attributed to the division's subtlety as much as the company in its entirety changing over time. ALL their games used to display a passion they had for creating games, which faded more and more over time, as they grew more successful and bigger, and the technical process of creating their games required larger teams and moved away from a small group that loved what they were doing and did all the work, themselves. Most of the old gaming companies that have survived since the early 90s have gone through such downward evolutions, and several of them are REPUTED for that negative approach to game production/development nowadays. Just look at Activision, Electronic Arts, and id. 2 of them became reviled publishers, and one of them fell off the radar, save for creating the (largely considered bland) game here and there. Blizzard North's only real distinction was being canned by the parent company, but that doesn't mean Diablo III would have been much better had they still been around. Blizzard's approach to making games would still have been the same, and those "standards" would have trickled down, regardless of who from the previous team might still have been around...