Do you have family or friends who scoff at your comic book collection? Tell them to take this class being offered by the University of Colorado and then get back to you. It just started yesterday and is called "Comic Books and Graphic Novels." The school is offering it free online via Coursera. The syllabus actually looks pretty good. Most of the stuff I have read but some of it not in years.
Here is the general course description:
Comic books have arrived! "Comic Books and Graphic Novels" presents a survey of the Anglo-American comic book canon and of the major graphic novels in circulation in the United States today. Its governing question is simple: by what terms can we discuss comic books as literary art? In pursuit of that question it develops a theory of literary reading and time itself.
You can check out the more in-depth description and read the syllabus here.
*Disclaimer: The class is free but Coursera is a for-profit company. I am in no way affiliated with it.