By the way, putting in that shot of the black dragon breathing acid at the start was a brilliant stroke. First of all - it's a dragon! That's always going to get attention form basically everyone. Secondly, for people not familiar with D&D, seeing a dragon breathing something other than flame is going to be intriguing - "What was that? Oh, the ground is sizzling, is that acid? A dragon that breathes acid? That's different and interesting!" Thirdly, for D&D fans, seeing that the production team researched enough to have a non-fire-breathing dragon featured, and got that past the execs who would likely just go "People just think dragons breathe fire, so make it breathe fire" is hugely re-assuring that they're going to adhere to the spirit of the game as much as possible.
Of course, the put in a lot of other fan-pleasing bits as well (and I will cheerfully admit I let out quite a few delighted "oooohs" as the trailer progressed). Just going by comments I've read on YouTube, which is usually a cesspool of seething hatred by fans of pre-existing IPs when they get adapted, they've seemed to have nailed it, with a lot of people going "I thought this was going to suck, but it actually looks, at worst, decent, if not outright good", with outright negative comments being shockingly few and far between.
Also, it's at nearly 2.5 million views in just a few hours. That's a very impressive and encouraging.