- The dialogue. A lot of people associate wooden dialogue with all six films, when Empire and SW contain hundreds of memorable lines. There are tons of witty, funny, colorful and creative lines and I think some people forget how good the dialogue was in the OT after seeing the prequels. Everything Obiwan says in ANH and Han and Yoda say in ESB rock!!!
-The acting, especially Mark Hamill, who was very believable as Luke came of age in the three films. Plus, he is a big part of the reason Yoda was so believable (if he hadn't taken Yoda seriously, we wouldn't have)
-I think a lot of people underestimate just how good the SW trilogy is. They are true classics and their popularity over so many years proves it. Do people still care about Annie Hall or Ordinary People?!