I didn't want to quote everyone above talking about all of the Star Wars above, but I did want to offer my opinion too.
The original three (Episodes 4, 5, and 6) are of course classics - it's tough for me to pick a favorite because they are three parts of one continuous narrative to me. I will say that, IMHO, people gush far too much over "The Empire Strikes Back" and are far too critical of "Return of the Jedi". Just my opinion, of course - I really like all three films.
The prequels - well, they're not as good as first three released, but they are not unwelcome either. "The Phantom Menace", as many said above, is easily the worst. (Every time I see/hear/endure Jar-Jar Binks, mee-sa wanna puke! ) "Attack Of The Clones" I like - I thought this film got too much abuse too. "Revenge Of The Sith" is the best of the three, but it had to be or there would have been hell to pay. "Rogue One", despite being released more recently, is really another prequel - and it is MUCH better than any of the original prequels - in fact, I'd rate it among the best of all the films so far.
I was very happy with "The Force Awakens", despite the broad brushstrokes of the plot being very familiar. It was a good modern continuation of the story. "The Last Jedi" I liked, but I didn't love - I preferred "The Force Awakens". I'm hoping the final(?) installment coming in Dec. 2019 will make me appreciate "The Last Jedi" more.
I'm looking forward to the "Solo" spin-off - if it's anywhere as good as "Rogue One", I'd be very happy.