They are extremely ugly? I can't figure out why.
I'm not completely sure but I do have two ideas for you to try:
Increase the texture resolution to make it more sharp.
It doesn't look to be using distance fields, just regular bi-linear filtering. Read about Distance fields, which is one of the best ways to render sharp text, maybe this will help.
You should edit your Import Settings fields to fit the image to your desires (this is done by clicking on the texture in the Project Browser window):
By changing Wrap Mode to Clamp, Filter Mode to Point, and setting the highest possible resolution in the Max Size list, and setting the Format to Truecolor.
Something like this should be enough:
Just click Apply and that's all!