My background in the printing and editing fields makes me much more conscious of 'type'. I used to look at a type face in use and compare it mentally with other fonts i could or would have chosen. Also I tend to look at the variety of fonts used in a particular document. Most print designers will try to use very different fonts on the same page for emphasis or to attract attention. They try to never use more than two fonts on the same page.
Since I started scrolling I tend to look at fonts thinking, "What would happen if I tried to scroll that font?"
Now I look at the serifs and descenders and more so the letters with 'closed loops' and how I would adapt them to avoid 'floaters'. Where could I place a 'tie' to keep them from occurring and dropping out. And in placing that tie how would the finished font look.
Just my thoughts on what I look for....
~~~GrayBeard~~~