Here's how I definie 'nostalgia', as per my experience with incredibly ardent SW fans:
1) Complaining about the dialogue in the Prequels while simultaneously ignoring the well-documented fact that the dialogue in the OT is just as bad (if you need proof of that, go watch 'Empire of Dreams', and count the number of times that the 3 main leads comment about the difficulty they had in delivering their lines and taking them seriously. Even lines from the OT that worked - like Vader telling Luke that he's really his father - aren't truly the height of sophistication from a writing standpoint, as evidenced by the fact that even said line has ended up becoming the subject of parody and distortion.
2) Complaining about hokey sequences in the PT while ignoring equally hokey sequences in the OT. I'm a SW fan, but if you were going to ask me what the hokiest thing about the OT was, I'd tell you that it's Threepio constantly getting blown up/knocked apart and having to be repaired. Yes, it works, but it's extremely hokey. Most of the situations that Jar Jar finds himself in in TPM are just as hokey, yet nobody seems to complain about the hokiness of Threepio getting knocked about and falling apart.
3) Complaining about 'flat, one-dimensional characters' in the PT (the Neimoidians, some of the Jedi Council members, etc.) while ignoring the fact that, outside of the main characters, almost everyone else in the OT is equally 'flat and one-dimensional', particularly the Empire's officers. Even Tarkin is a very one-dimensional character at his core.
It should be noted that none of these things detract from my enjoyment of either the PT or OT; they're just simply part of what SW is, yet nostalgia has dulled people's acceptance of that to the point where they pick out flaws from the PT without considering and recognizing that the same flaws are part of the 'OT' as well.
I'm gonna go point by point, I guess.
1. Dialogue is often
reflexive of the characters and the type of story. In the case of the OT, they were using variations of
mythological archetypes. That's why they were simple. Things like the production design as well as
what was said aby the characters about the universe made the universe that SW is in
seem much bigger. The characters also
worked. They were not deep characters, but they were
tangible, relateable, and, most of all, believable. As simple as they came across, it also felt like there was
more beneath the surface, and to wach them even in non-speaking moments is to see them thinking, to anticipate how they would react. You know that Han wanted to object to Obi Wan as being crazy long before he actually said it verbally (and, even then, it was only after Chewie voiced his dissatisfaction first)
This nuance is often lost in the new films, as everything is telegraphed and delivered in a flat, cardboard way. We are
told that characters in the prequel films are friends, but in the OT, we
feel that they are. Plus, the "bad" dialogue in the original film really felt fresh, because it was a homage to simpler, serial-type story telling. As a kid I loved the bickering and loose tension between Han and Leia. It didn't feel forced. Lucas (back when he had drive, talent, and checks and balances) tested the actors
together to see the chemistry with each other,
2. C-3P0 was effeminate comic relief, and, for all his antics, none of the things that happened to him in the OT seemed to fly in the face of phyisics. He was only taken apart n
Empire, and for good reason. In the original, we have Jar Jar in cartoon style running to avoid blue spheres by contorting his body like the cartoon he is. We have C-3p0 falling and hitting a flying platform, grabbed by a claw and thrown about as if he is made out of nothing. My least favorite sequence in the PT is the R2 units repairing the queens ship. i know that these movies don't follow science at all, particularly with regards to space, but at least the original trilogy treated flying in space with the same kind of respect as if tehy were flying in the air or anywhere, so, as a result, the R2 units always fit into a slot on the ships so they wouldn't fly away from momentum when the ship went forward, but this sequence, the ship is moving, the droids are rolling around on top and working. That was too much too swallow. For more on what I mean, see here,
the dissolution of tension.
3. This was covered already. In any film, characters other than the main ones could be considreed flat, unless they are written exceedingly well for what they are, and if the character himself or herself has
presence. Tarkin had
presence to spare, and through him, we got into what must be the typical mindset of all the Moffs. He inbued this simple role with a lot of presence and we really felt that the Empire was larger than we could ever see on screen. Some of the other minor characters in the OT had presence too, but this is lacking in the new trilogy for background characters. I mean, one bounty hunter hires another to do his job, and he gives her a tube of centipedes, and all she does with it is walk four steps and put that tube into a droid. I ask,
why couldn't he do that?