If you don't believe me that graphic novels are AMAZING, here are some people smarter than me telling you so. I've curated some resources in several areas, any of which may help convince you or other educators that graphic novels belong in the classroom.
THE VISUAL LANGUAGE LAB - DR. NEIL COHN
Dr. Cohn (Ph.D. in Psychology) has done extensive work studying how graphic novels affect the brain. His growing body of work, along with other experts doing actual research, can be found on his website, The Visual Language Lab.
Former teacher and author, Gene Luen Yang, shared why comics belong in the classroom.
COMMON CORE STATE STANDARDS - ENGLISH LANGUAGE ARTS
CCSS for grades 6-12 names graphic novels as one of the types of text that students should be engaged with as part of their study of literature.
GRAPHIC NOVELS AND STATE STANDARDS - MAUREEN BAKIS
Bakis shares her journey and reasoning behind integrating graphic novels into her classroom and their connection to properly implementing State Standards