It's very good, and you don't have to have ever touched DnD to enjoy it.
It's got some DnD stuff for the people who know, but otherwise they're just using the setting to make a really fun adventure flick.
Highly recommended.
I was pleasantly surprised, I didn't realize Hollywood still knew how to make good adventure flicks. It has restraint and isn't insufferably quippy or self-fellating. I'm actually disappointed I missed it in the theaters because it would have been a great sort of lowest common denominator* movie to see with a group.
* I don't mean this disparagingly. I think it's a positive quality in a movie to see with family and friends, so you're not worried about killing the mood, it going over someone's head or being too niche. Part of why I don't see movies very often anymore is the stuff that's supposed to be safe and have broad appeal has become absolutely painful.
I found a YouTube link in your post. Here are links to the same video on alternative frontends that protect your privacy:
