Blizzard is dead for quite some time now, the original people who made Warcraft, Starcraft, Diablo are retired, left company, etc. that's why we get this mess of WoW, Overwatch and other crazies.
Even for Starcraft remaster they said they didn't even have the source let alone would know how it worked lol So they had to recreate the game.
Personally I don't get the Diablo hype at all, Diablo 1... OK? Well mediocre. Diablo 2? Uber clicker mouse switch killer is all it was, might as well get a click script, story? What story, meh, just run and click for 99% of the game.
Warcraft 3... it was OK, unbalanced but a good game, WoW? Bleh, money grab MMO not a strategy game. All W3 did was continue Starcraft in spawning MOBAs as mods (DOTA, LOL, ...).
SC2 was nice but I still prefer SC1+BW even at low resolution graphics of the free remake.
Same as Valve, Blizzard has moved on, the good original people have moved on, don't expect very good games from these anymore, they've turned into a $$$ making machine spawning remakes and DLCs and next chapters of the same game, not making anything new, instead trying to get that MMO, massive online gameplay base $$$.