First, thanks for undertaking this project. It is helpful.
I think that a quantitative rating would be more helpful, however, than a qualitative.
If the shoe fits with 4 Stars, it is self-explanatory, but all other fittings may be less than perfect because they are too long or too short, too wide or too narrow. This is very important.
If I and another gentleman each rate a shoe 3 Stars, he because it is a bit wide and I because it is a bit narrow, and he rates a shoe I am interested in as 2 Stars because it is just too wide, well, it might be a good fit for me, even with a 2 Star rating from him.
I hope that makes sense.