The only problem right now - we are out of time to optimize the game to run on a large variety of older video cards. Which is something we plan to work on later on. From our perspective - the lower we can bring minimal requirements the better - more players, so we`ll do all we can in the future to lower video card requirements.
So I guess we can assume if you design this game for low end GeForce 7600 and below v3 shaders theres gonna be allot of play in graphics adjustment.
Those older V3 cards only did like 6-14 billion colors a second, and the newer ones like mine do 47 Billion with shader v4. I would hope i could get it to not look like Diablo and more like Empire Total War, Which by the way kick ass..
just some thoughts