I mean, what is MS's track record when acquiring game companies?
Let's see...Fable, surely they've had a hit Fable game since...oh, nope. They actually closed the studio who made those games and shit out a Fable game for their terrible "motion" control: Kinect.
Rare...yeah, ugh.
Halo...Microsoft managed to take Halo and make it worse. Not that Bungie is doing anything good at the moment either.
Oh, Gears of War, surely we got a new game coming for this hit franchi...oh, nothing?
Inxile, Double Fine? Nothing?

So, out of the dozens of studios MS purchased, most have shut down, and Obsidian and Ninja Theory seem to be the only ones putting out content that people seem to like. Mojang is just sitting on their Minecraft income.

Zenimax seems to be at least maintaining some of their own IPs. ESO is still chugging along. I wouldn't say anything has really changed for better or worse here. The studios they owned are still either doing good games or shitting out sequels.

Actiblizz - Can we even say this is bad? I mean, they have been in "shit out sequels" mode for a decade or more. COD every year for a long time. WoW has not really done anything great in a decade. They desperately need to make a sequel with improved gameplay mechanics and graphics, but they won't, because it's easier to just shit out expansions. DIII was pretty good, but I can't even make myself play DIV. And Toys for Bob is pretty much done for. I don't think MS is even capable of making this company worse than it was.

So who cares? Blizzard is not the company making the games we all loved from decades past. They're in maintenance mode, chugging along, shitting out sequels that barely increment on the franchise, with no innovation. Nobody can screw it up worse than they already did. Hell, I hear MS is even bringing back development to Heroes of the Storm, so they can have another revenue stream again. Whoo. Hoo.