It has been my experience in life that you learn the most from past mistakes, whether they be of your own doing or from someone else. (Unfortunately, sometimes I have to make the same mistake several times before I finally catch on and move forward.) The same goes in the creative world. Being able to identify the bad can help us be able to more easily identify the good.
Darious Britt advocates just that in a recent video he shared on his YouTube channel. As he says in the 5-minute clip, “If you’re a doctor, how can you get good at diagnosing sick patients if all you’ve ever evaluated are healthy patients?” And he’s right. Analyzing great movies (and I venture to postulate that there are very few that fall into this category) is also a good practice when learning and honing your own skills, but it’s much harder to see what is truly great in it until you can understand what is truly bad.