You're not becoming more stupid - Hollywood IS. In their quest for more return at the box office they make dumber movies that appeal to a large share of their target market (which is anyone with eyeballs - *thanks to Argo for that great line). Audiences, in turn, think that they are seeing really great films as the bar becomes lower with each passing year. In the end it is a complete circle and audiences end up getting the quality of films that they deserve because Hollywood told them so.