I'm curious as to how many of those protesters actually cared about Hong Kong until the Hearthstone issue came up. But anyway:
I can't fault the cinematic trailer. I mean, I said that the storyline should have ended at D3, but that wasn't going to happen, and RoS and the Adventure Mode lore established that things can go very south, very quickly in Sanctuary. Turns out D4 shows just how south they can go from what I've read. Also, if you were going to bring a villain back, Lilith is a pretty sound choice. But if the person in the cinematic is Rathma...why? He despised her during the Sin War, what's with the about-turn? Also, calling it, the temple they're in is the Temple of the Firstborn. Also turns out all you need is blood to remove Lilith from the Abyss because....I dunno, magic.
As for the gameplay though...ugh. It looks drab. Really drab. Nevermind that we've got three returning classes (because God forbid we make new ones), but the entire thing is just...well, drab. Grey, drab, and boring. Seriously, you could probably put any screenshot of D4 alongside a PoE one and have people struggle to say which is from which game. And I know some smartarse is going to say "that's how Diablo IV should look, haven't you played D1/D2?" To which I say "yes, I have, but now D4 looks like every other ARPG that goes for this aesthetic." I'll be honest, the gameplay trailer for Diablo Immortal looks better from an aesthetic standpoint because it manages to capture the Gothic aesthetic while retaining a distinct look.
Still, from what I've read, the game seems to be going for a middleground for D2 and D3, so, um, yay?