I appreciate the effort, but your edit looks like a night scene, and even then it's a bit washed out. I would say that the colors just need a bit more contrast and perhaps just slightly mellowed out. Other than that it's really just the models and textures, which can't be achieved with filters ( in regards to movie editing - you might be able to get a good filter on a still image ). As for many of the models, they are just far too exaggerated which isn't cohesive with the look of the previous Diablo games. You couldn't change the look of the models without significant Photoshop work.
You must be using a weird avi codec because it freezes when I try and play it.
Edit: Got it to work finally. You made it like 1000 times too gray.