While A New Hope was revolutionary, it is like Raiders of the Lost Ark. It hasn't aged the best with me. Being the first doesn't mean it was done the best. Alot of nostalgic blindness is what keeps Episode IV rated higher than III & VI in alot of purists' eyes. The movie is an absolute bore those first 30 min and Mark Hamill isn't exactly a great actor to begin with. Make no mistake. Vader's bad---ness and Han Solo carried the OT and made them more appealing to watch than the prequels. Stuff with Yoda, Princess Leia, and Boba Fett were just icing on the cake.
Ooooh I watched ANH yesterday so I'm definitely going to disagree with this being a bore in the first 30 minutes!
It sets the scene fantastically - the opening crawl, and then the camera pans down to see a massive F-off Star Destroyer chasing down the Tantive. Laser blasts firing back and forth, it looks fantastic. That MUSIC as well, urrrghhh it's amazing. It immediately sets the scene and shows you everything you need to know; how helpless/small the Rebels are and just how ominous the Empire is.
That scene with Vader too, lifting up the captain and crushing his throat ... damn, what a villain.
The scenes/shots on Tatooine just add more interest to the Star Wars universe. All the different creatures and characters. The 'show not tell' with the Jawas abducting R2/3PO introduce how they're scavangers and aren't opposed to being a little underhand. The Tusken Raiders just burst onto the screen. The Obi Wan scene is great too, with his ambiguous description about the Clone Wars, what happened to Luke's father, what a Jedi Knight is, "a more elegant weapon for a more civilised age ... before the dark times ... before the Empire ...", how the Force is an energy field that surrounds and binds all living things. It sets the scene and is brilliantly paced. It throws us in the universe without patronising us with explanations.
Uncle Owen and Aunt Beru being charred to a crisp - damn that's brutal! Han gunning down Greedo because he's a bad-ass, not out of self-defence (thanks for killing that in the remastered, Lucas).
And those are just the 'slow' bits.
If anything I think the prequels have tainted just how good Episode IV is, because a lot of people think "I know this, this is boring".
Jedi is still my personal favourite because I think it wraps up the saga beautifully and the Emperor's performance is just jaw-dropping. However IV and V are equally as good, if not better.
Also my favourite from the prequels is Episode I. Yes, it's got Jar Jar. Yes, it's a kid's film.
But you know what? When you watch it, it's visually stunning. You can
see the effort put into it. There are all sets and limited/correct use of CGI. The music is stunning and you can just see the years and years of work that people piled into it. There was a lot of love in it, and literally the only reason it sucked so hard was because only Lucas wrote the script and didn't let anybody else change it. His arrogance killed the film.
Compare this to Episode II and III. They've practically got ~5 minute scenes where
everything -- and I mean everything -- is CGI (poor dated CGI at that). We're essentially watching nothing, just a green screen. The films were lazy and overused CGI to compensate for having to make any effort in the sets.
That's why TPM is my favourite. It was a disaster but by gum did they ever try and make up for Lucas' script.