From Offworld:

When Gearbox’s Randy Pitchford explained the new art style of Borderlands to the press, he described it as a “mutiny”. His art team had apparently gone back to their concept art assets and realized that, ultimately, their drawings and paintings had more character and appeal than the art-style that had ended up in the version of the game they had at that time.

Take a look at the dramatic before and after videos and see how significantly a few filters can change the whole look and marketing plan for a game.