Hey
I imported a 300x400 png texture and Unity scaled it to 256x512.
Another texture that I imported which was a 300x100 was scaled to 256x128 and the quality of that texture made it look like it was 4x2 pixels
What is going on?
Thank you in advance 
That’s normal behavior, if a bit unintuitive. Various optimizations are performed by default: texture dimensions are scaled to a power of two, mip maps are generated, data is compressed, and so on.
You can override many of those by changing texture import settings (select the asset in your Project view, then set it up in the Inspector).
The first and most obvious setting to change is the texture type: “sprite” and “GUI” are popular options to resolve some of your complaints. Bear in mind that textures imported with those modes will consume more memory (the defaults are defaults for a reason).