I saw it in the theater with my dad. If you like Tolkein, it's a good movie. It's a bit slow, I'd say, and I'm not a fan of war movies, so the parts about World War I did not appeal to me. On the other hand, it gives a beautiful image of Edwardian England and the civilization that had existed for nearly two millennia prior that was destroyed by World War I.
A lot of the movie, as I recall, is about Tolkein hanging out with his friends drinking tea in a bar that no longer exists, in a picturesque London neighborhood. My recollections about the movie honestly are pretty vague.
Nothing really objectionable from a 6th/9th point of view that I recall. If you like Tolkein, I'd say give it a shot. There's not much to lose. You can probably stream it on Amazon for three dollars.