With so many bad video game based movies, I'd be rather hesitant to watch either. However, Blizzard has always had such a vibrant, enthralling lore behind each of their big titles that it might just work, if they keep with the Blizzard timeline, lore, and plot. If they go off of what Blizzard has already set for their games, it could create significant problems.
I just don't want it to become another Doom class movie.