Holy shit. I have seen a lot of in-game movies in my day. Some are funny (zinrath), some are educational and inspirational for playing a class (Nerf sap series), and then you have something like this.
This is, by far, THE BEST in-game movie I have EVER seen in my life. The editing and production levels are of the highest quality possible. The music choices are superb, the voice acting is excellent in places (although a little weak or corny in some), and the sound effects are absolutely top notch.
But best of all, the story is just outstanding. I recommend this movie to ANYONE who's interested in fantasy-based stories, whether you enjoy world of warcraft or not.
This has my absolute highest recommendation.