You can largely improve the graphics in classic to near that of BFA by going into your graphics settings and doing the following:
Open wow -> Open Menu -> Settings -> Graphics
Anti-Aliasing MSAA 8x
Vsync Off
Graphics Settings -> 10
Render Scale 200%
Open Nvidia Control Panel -> Manage 3d Settings
Antialiasing FXAA - Off
Antialiasing Mode - Application Controlled
Antialiasing Setting - Application Controlled
Antialiasing - Transparency - 8x
DSR Factors - 4.00x
DSR Smoothness - 0%
Low Latency Mode - Ultra * New feature with newest drivers that is real nice.
Enjoy