Overall, Hero is very good as a first outing. The soundtrack is appropriate, as is the foley. The animation is as close to natural as WoW gets, though the moving characters set on a stationary backdrop is always a little jarring. That just comes with the territory though and will just get better with time.
If I were to give one piece of advice, I would suggest practicing with a less epic tale for the next go around. It's understandably hard to include intense action sequences and things of that sort when it's your very first go at machinima, but some of the events seem to happen a bit randomly because of it. Any resistance the Alliance put up was off screen, except for our hero being punted off of a seemingly abandoned ship. Deus ex Diabolus keeps our hero from eating dirt. Making these sequences a bit more smooth and sensical would add a lot to these stories. I look forward to Bridin's future work, and considering Hero comes with the prefix Warcraft Stories, I'm hoping that there's a whole lot more coming our way.