Textures
Anti-aliasing
Shadows
AA and shadows should not be hard to improve and all the constant shimmering and general unstableness of the image is really jarring, especially after playing other games for some time.
And the shadows sometimes just completely break in distant areas like mountains.
I don't know how it is in other languages, but in german the setting for AA is literally choosing between Off and Low, so they know its bad, just implement a better one god dammit.