Have you ever heard of Machinima (muh-sheen-eh-mah)? I only recently discovered it, but Machinima is film making using real-time 3D video-game technology.
It's really kind of interesting to see creative uses of the video game engine technologies to create animated videos. One Machinima animated series that I found I like was one called 'Red Vs Blue'. Its very funny, but it contains a lot of profanity. If this bothers you then I would not recommend watching it.
The Machinima animation quality is good but low end. Although, I can really see this film technique taking off, and the animation quality increasing very quickly. I look forward to see where it goes.