I have'nt paid to see a SW movie sense 'Empire'.
That's a terrific film! Ever read the Harlan Ellison novella?
I don't agree that it is the best SF movie ever, but you're quite correct about one thing: the cult classic "A Boy and His Dog" has the best ending in MOVIE HISTORY! It's very stupid (in places) and very low-budget, but the ending is worth the price of admission (or, in this case, rental).
It's sad but true that the big SPECIAL EFFECTS flicks they make now-a-days have none of the class or creativity of films from the 50's, 60's & 70's. I will give Spielberg credit for single-handidly trying to revive the genre with AI, Minority Report, and others, but so far he hasn't come up with a knock-out...
The only film from modern times that compares with the oldies is "The Matrix" --but that's more of a Kung-Fu film than SF...