I took my two older kids to see the first Star Wars movie, along with a friend and some of his kids. I enjoyed it at the time, but then again, I have been a science fiction fan since I was a kid myself. I also went to see the next two in the series, but that was it. My guess is that if anyone watches the original Star Wars today they would think it is cheesy and dumb.
FWIW, when I returned from Germany after 3 years there, with my family, we arrived in Maryland for my next Army assignment at Aberdeen Proving Grounds. That first weekend home we went to a local movie theater in the mall just to fill in an afternoon (we were staying at a motel waiting for our house to be ready). A movie was playing, in fact had just opened, that none of us knew anything about at all. It was "Raiders of the Lost Ark" and we were all just blown away by this film. That was probably among the most exciting movie experiences of my life in part because I had no idea of what this film was about before seeing it.