"Frank is such a great visual storyteller, that if you study his artwork you see that his Sin City books are already the best movies never seen on the big screen"

In this quote, Robert Rodriguez is praising Frank Miller's abilities as a visual writer. He believes that Miller's art work is so powerful and fascinating that it can tell a story just as efficiently as a motion picture. Rodriguez particularly discusses Miller's "Sin City" books, mentioning that they are currently the best movies never ever seen on the big screen. This suggests that Miller's artwork is so comprehensive and immersive that it can transport the audience into the world of "Sin City" without the need for a movie adjustment. Rodriguez's appreciation for Miller's storytelling abilities highlights the impact and skill of Miller as an artist.