I'm sorry, but I have to disagree with almost everything in there.
First of all, what he doesn't say in his "OMG they closed Blizzard North" statement is that the "3 key people", Brevik and both Schaefers, had left Blizzard North in 2003 already (yes, just one year after the development started - though it conceptually even started a bit earlier). So Blizzard North was already sort of dismantled for two years and Diablo 3 going nowhere when they closed it.
Second, the video starts by telling us that Diablo 1+2 sold 6.5 million copies and then quotes Brevik that his idea would've sold well. To be honest, Diablo 3 already has a cumulative number of 30m sold copies, almost 5 times as many as "his" earlier games. He, on the other hand, has produced basically nothing since leaving Blizzard. I worship him for the amazing games he created, but I don't like that he's just going around and giving interviews everywhere, trashtalking Diablo, but if he would've done such a better job, why in those 13 years since he left hasn't he created anything like it? Anything at all that recreates the feeling he's missing from D3? It's not really good style to talk about your former employer like that, and it's especially strange to do it when you have nothing to show to back up the claim that you would've done a better job.
The rest of the video is pretty much the typical story and "darkness" rant. He's comparing random D3 campaign areas to CS and the Throne Room... really? Please compare Westmarch to Lut Gholein and tell me which is darker. Also, he's complaining about the lack of Tyrael's post-Diablo speech, but probably forgot that that was moved into the cut scene. I'm not saying it's better, but it's really comparing apples and oranges. I agree overall that the story of D3 wasn't as good as D2/D1 (actually, I think it was really rather weak), and of course I agree like everyone that the way Cain was killed off was ridiculous. It might've as well been an accident while cooking pasta. Nevertheless, his assessment is very subjective and oftentimes not fair.
Another thing that makes me rage is the class comparison. "A wizard is just a wizard and casts spells. A paladin in Diablo 2 has a variety of different playstyles, such as being a smiter tank or casting holy spells." Holy crap, what a piece of BS? Let me turn this around: "A sorcerer is just a sorcerer and casts spells. A crusader in Diablo 3 has a variety of different playstyles, such as being a thorns tank or casting lightning spells. Or having an army of Bowmen. Or searing the enemies with holy fire from above. Or ride to Valhalla on his horse. Or pulling mobs together in a group." Seriously, are you kidding me?
And of course I expected the "no trading, boo-hoo" rant. This is just so ignorant of the history of trading in Diablo, and all the explanations of Jay Wilson, Josh Mosqueira, and others. We've been there, done that, the AH killed the game, and it's good that it's gone. And trading with it. I'd kill the fun for all my friends if I'd just hand them full sets and ancients when they come online.
I'm gonna have to watch some cat videos now to calm down. What a piece of....