Discussing typefaces with people who have just started to learn and practice design is tricky. There are good and bad typefaces. But there are also personal preferences and aversions. For a teacher—and a professional designer—it is important to differentiate the two correctly.
Obvious criteria for good typefaces are consistency, efficiency, elegance, versatility, and robustness. It is important to learn about the functional and aesthetic qualities of letters as well as the production quality of a typeface. Students and professional designers should be able to judge typefaces based on these criteria.