I get bad texture filtering on my R9 270X which somewhat looks like missing mipmaps. It only affects newer games. Total War Warhammer is especially prone to this. In the driver, Texture Filtering Quality is set to High. I also can never ever get Adaptive AA or Supersampling AA to work. I have the latest driver installed.
Video Link to what it looks like (170 MB). Look at the fields to the left between the forest and the army as soon as the Empire army is visible.