A New Hope
Empire Strikes Back
Rogue One
Return Jedi
then a big gap to Revenge of the Sith
.... The Rest are Crap
I've always had a theory. If you were a kid when A New Hope was released, saw it in the theater and lived through the hype, that is most likely your favorite of the Star Wars movies. If you were born later, after the first trilogy was released, you tend to like Empire better. Empire is probably a better movie, but seeing a New Hope for the first time... there was nothing compared to that experience (although waiting for the release of Empire was fun, too).
BTW - Empire absolutely should have been nominated for Best Picture. With the exception of Raging Bull and maybe Ordinary People, it deserved a nod over any of the others (Tess? Coal Miner's Daughter? Really?)