After 2008 Blizzard produced Hearthstone, Overwatch and Reaper of Souls which consensus 'fixed' Diablo 3 and were all pretty great. So I can't comment about the culture but I disagree with the general narrative that Blizzard's games have gone off a cliff. That might still be coming, but it hasn't happened quite yet.
Edit: snipped the bit about Hero's of the Storm since that was post acquisition
Edit: snipped the bit about Hero's of the Storm since that was post acquisition