When Diablo 3 was first revealed, it was met several negative reactions towards the overall look of the game. While some praised the game and its graphics, others said that the game felt too cartoony and lost the "dark" feel that was felt strongly in the first Diablo. If you belong to the latter category it appears that a mod is available that will allow you to "darken" the mood of the game. This mod was used for Skyrim and seems to be available for Diablo 3 as well, although we're not sure if the mod will still be usable once Diablo 3 is finalized and is out of beta.
Ubergizmo
See also:
technologypulse, Diablo 3 mod lets you âdarkenâ the mood of the game