Now this is how you end a trilogy and this is how you conclude a climax of one of the greatest sci-fi stories to be told.
There's things to criticise, yes, there's things that could have been improved, yes, but ultimately, George Lucas managed to give us a great end result that, at least to me, is one of the best sci fi movies ever made and certainly the second best, if not the best Star Wars Episode.
Now, some CGI hasn't aged well, we all know it, like for example all clones you'll see in the movies, they just look terrible, but some other still looks amazing, look at the end battle on Mustafar. Gosh the rendering of the environment of that planet is amazing. Also, the dialogues feel more adult and less goofy in comparison to both episode Lucas had made before (i'm referring to the prequels of course). Also, even if some of the acting performances still show to be bad (in a way), there's been some important improvement compared to Star Wars episode II.
This movie also has some depth in the confrontation between Jedi and Sith that has never been brought in any other Star Wars movie. You can understand why Anakin joins the Sith and what motivates Palpatine to be this evil. This movie shows us, what the similarities between Jedi and Sith are and ultimately shows us what the main differences are. It gives us context and gives us the reasons why you may join the dark side. What I mean by this is that, usually the Sith are evil because the script wants it, there's no real reason to it, look at the sequels, why does the first order handle they way it does, because they are evil, that's what we'll be told, but they ultimately lack of a realistic motivation, which makes those movies childish and boring. Now, in this movie, we get to know what Sith want, as Anakin says himself, and I believe Palpatine does too, they want to bring peace, justice and security. What differentiates them from the Jedi is that they want to obtain that, by having full control of the people and institutions, not letting any opponent exist and through an establishment of fear amongst people. This is similar to Hobbes' Leviathan in a way and gives this movie philosophical depth, at least to some degree. I know of course that the philosophical or political ideas aren't very complicated in this movie, but I like the fact that at least it gives you some food for thought, something that the sequels for example do not!
So I do certainly not understand why this movie is rated below Star Wars VII, please join me to fix this! (Also, this movie contains the two best fight scene from the entire Saga, Yoda vs Darth Sidious and Anakin vs Obi-Wan)
That's all folks.