By far the biggest complaint is that the game has jagged shadows, as if they were rendered in older 16-bit visuals, so a lot of people want a solution.
In order to change this, located the "bUseMaxQualityMode" entry (located towards the end of the .ini file) and change its setting from "False" to "True" (without the quotes).
While this will make the game look better and solve some of the shadow issues, many players are reporting that it pretty much makes it unplayable, because it uses only the best textures, thus reducing framerate.
Another possible solution is to locate the "AllowD3D10" entry (located below bUseMaxQualityMode) and change its entry from "False" to "True".