I disagree. I think the Star Wars films and the Star Trek TV shows are probably the two worst examples of science fiction imaginable. It is unfortunate that the layman, who never reads, is likely to name these two franchise as examples of good science fiction, but they are space fantasy with starships and aliens instead of wizards and dragons. Sure, I enjoyed Star Wars when I was twelve or thirteen, but they are as not nearly as deep as Solaris (the book) or Dune (the book).
Everyone has the right to respectfully disagree. But I love Star Wars (and Star Trek) as much now in my 30's as I did when I was 4. I've never asked anyone's permission to enjoy Star War and never will. With that said, I'm not one of those uninformed people that you mention and I have to admit that I resent being used as an example of a person who has not read science fiction. Asimov, Bradbury, Heinlein, Herbert, and a slew of other science fiction authors have been the staple of my reading over the years in addition to Lucas, Straczynski, Tolkien, Liebert, Lewis, Leguinn, etc, etc.
The real problem with science fiction is that there are people who think they are the guardians of the genre and go out of their way to disassociate the genre from anything remotely popular and in the process alienate the casual and curious science fiction reader who has discovered sci fi but has not had a chance to explore the genre. Unfortunately, these so-called guardians scare people off from becoming sci fi fans and play a huge role in the bastardization of sci-fi from the rest of literature.
I have always loved science fiction and will not let someone tell me that Dune is more relevant than Star Wars simply because they feel ecology or anthropology are subjects that echo more loudly with a particular reader than metaphysics, philosophy, or spirituality. Sci-fi is not the domain of the few. Who cares if Star Wars pays less attention to the science involved in its stories than Ender's Game? If this is the case, then where does this leave War of the Worlds, Journey to the Center of the Earth, Twenty thousand Leagues Under the Sea or The Lost World? Or do we give more points to those who strive to be scientifically accurate over those who are scientific visionaries? By your insipid standard, I would have to disregard nearly every single science fiction novel written before the advent of computers into the trash.
I read fantasy and science fiction because they explore possibility and alternate realities. How dare any of us attempt to condemn those who dream of other worlds and realities just because we don't share those visions. I will continue to watch The Empire Strikes Back with a big fat smile on my face while others read Dune with an Elitist attitude. When I read Dune I will do so knowing that Frank Herbert allowed me to share his vision to the future, not as a member of a private club, but as a person who also has his own dream of the future even if it happens to be different from yours.