Would have been the best among the oldest 3 movies if it wasn't for... I liked the movie. I liked the fact that we get to see more jedi scenes and more lightsabers compared to first 2 movies because let's face it, Star Trek is easily better if it wasn't for some little details such as lightsabers lol.
Anyway, I'd say this is the best movie among the 3 oldest movies but there were some ridiculious screenplays in the movie that I haven't really faced in the first 2 movies. First one is that, they promoted the darkside as a great force for 2 movies but the weakest species like ewoks were able to almost single handedly take care of the troops and machines of darkside.
Another problem was in the Luke's confortation scene with Darth Vader. The emperor tried to talk Luke into breaking bad by asking him to grab the lightsaber and kill the emperor ?? Well, eventually he did which I thought was kinda late. I could see Darth Vader interfering with it from the beginning. The father and son fought for mins as the emperor sayin' dumb stuff and enjoying 2 strong men tryin' to kill eachother unwillingnessly. It didn't seem genuine to me that Luke didn't go after the emperor few more times as he is fighting to his father, the real target was the emperor as Luke had little love for his father. It's even worse from Darth Vader's side. As we saw in the episode 3, Anakin was fooled by the emperor by giving a promise of saviour of his lovely wife and child from death which was forseen. But the wife died as I recall so emperor didn't really deliver anything. Plus, turning into darkside caused the fight against Obi Wan which led him to become a barely living armless, legless person who had to become a machine to keep living. So Darth Vader should have already betrayed the emperor after he was forced to fight with his son to death.
Let's try another perspective, Darth Vader was evil, yes it had very little good in him but it was only against his children not anything else, so isn't it kinda non sense that he didn't think of becoming the emperor himself by killing the emperor ? An evil man would want to be the boss there is no exception. In the movie he acts as if he is so loyal to his emperor but why ? He was suppossed to be evil, evil doesn't really feel loyal except something is in for them ? What was in for Vader anyway ? I believe the whole darkside was kinda bold in the movie and that last fighting scene made me think of those things... In the end Vader acts as if he was suppossed to from the beginning but still feels luckluster for me. I mean how can a guy that smart act like that ? Only reasonable explenation was that he was careless of life, he wanted to die already.