The author says up front that he considered this movie to be an experiment. Nef vs. Rai was intended to help explore the animation possibilities in World of Warcraft. It is a very short animation example, that pretty much can be summed up as "A dragon steps foot in Darnassus, an anime hero charges his lasers, and kills the dragon." The story wasn't complex, but probably wasn't meant to be. While the opening shot of a dragon landing is created using modified WoW graphics, the rest seems to be hand drawn.
The opening credit with the animated cat-form druid (Night Elf) was pretty neat. I liked the hand-drawn overlay in Darnassus, and what it did for the environment there. I'm not sure the animation of "Rai" did much for me. Something about the way Rai's face was drawn kind of put me off, and made it very difficult for me to understand what emotion the character was experiencing. But, I guess, the anime style can be kind of like that, with a lot of it being an acquired taste.
"Nef vs. Rai" isn't the worst freshman effort we've ever seen, but any follow-up would definitely need some story embellishment.