The original trilogy is certainly one of the better space epics your going to find. I used to like them but not obsess over them. I rewatched them years later and noticed just how great the set designs were. Outside of the Alien movies I think Star Wars had one of the most fully realized sci-fi settings out there. Plus the story was also well done although the dialogue and acting in general weren't anything special (with the exception of Harison Ford). I think it was the premise that made everything so fun to watch.

The prequels on the other hand were inferior in almost all areas. Questionable character designs. Abysmal acting. Too much green screen and an over-reliance on action, which wasn't pulled off that well to begin with. I have watched all of them once and that was enough for me.