Q u o t e: Gotta love how people immediately jump to the old "It's not done yet" defense.
What we saw at this year's Blizzcon is what we're getting people. It might look slightly different on release, but nothing the untrained eye would notice.
Are the graphics a little sub-par? Sure, but it's the gameplay that counts.
Except a lot of the advanced shaders aren't done yet.
Yes, what we saw at blizzcon is what we're getting in terms of polygons, and possibly even texture resolution, but advanced shaders, like AA and whatnot, aren't done yet, and those are the last few touches that add the "wow!" factor and end up being the difference between Medium and Ultra graphics.