[IshKebab]

I agree, though it's not as bad as something like FLTK. Also if you're writing Go there are basically no alternatives.

Still, kind of boggles my mind why some GUI toolkit authors put so much effort into a project but don't do the relatively small amount of work to make it look nice so people will actually want to use it.

It wouldn't take much more than fixing the margins and padding to be honest.