Very ironic that you mention ewoks when starwars is all of those things that you mentioned, as is the latest star trek movie (minus the politics).
I will give credit to the original Star Wars (episode 4) as being they type of science fiction that I like. SW does have more than a little fantasy to it, but the original movie nailed it (particularly Han Solo). As far as I am concerned, every SW movie since the first has been on a slow decline in quality and vision, tending more towards an after school cartoon than a serious story.
I can't believe that you are still dissapointed about ewoks are all these years. Get over it.
Oh, I'm 'over it'...all of Star Wars' 'it'. Lucas pretty much ran a good start into the ground at this point.
As for Star Trek, again, good call. My only problem with ST is that it is getting really boring now. Yes, the "reboot" was well done and had some of the sci-fi vision I'm looking for, but I am just really tired of revisiting the same characters over and over and over and over....
Star wars is not "pure" sci-fi, but thats what makes it so good.
That's a matter of opinion.
The isn't more sci-fi of the kind that you like because there isn't a big enough audience for it to be marketable.
Didn't you just say that SW and ST were the type of sci-fi I am looking for? Those blockbusters would seem to indicate that there is an audience for that type of sci-fi. What is more, if you add in three of the most classic sci-fi stories of all time - 2001, Alien (and Aliens, for that matter), Blade Runner - not only is there an audience for more serious sci-fi, but audiences seem to value such tales much more than all the softball sci-fi we've been drowning in lately.