We've lost a great storyteller who fundamentally transformed the genre, and the movies that followed. Heroes with real problems, from issues like Peter Parker's unrequited crushes to Tony Stark's alcoholism to the reluctance of the Fantastic Four to accept their new powers, Stan Lee's characters, including the villains, were real, and he ushered in a great age of comic writing. The incredible success of the Marvel Cinematic Universe attests to his desire to craft genuine characters, where their fears, struggles, flaws and triumphs were the central story, and the colorful costumes and super powers merely the venue in which those struggles took place.
RIP Stan Lee.