After re-watching ANH... they really need to remake parts of it. Some of it is just so bad and cringe. Bad effects, bad lines, bad acting...
Hallway scene with horrible acting and bad effects. Could be greatly improved instead of guys flopping over in the most comedic fashion possible. RO Vader hallway scene was epic, would be nice to get something of that quality.
The swing across the chasm scene is just bad. All of it. Bad dialogue as if we are in some video game and Leia is giving us instructions. The kiss for luck is laughable. Should be re-done.
The Vader/Kenobi fight is just awful. See SC38 for a real good fight.
I could go on. After watching Mando and then going back to the OT... as much as I enjoy them story wise... quality wise and acting wise not so much. Mando is probably the greatest quality Star Wars from all aspects that we will ever get.
See, that's where you lose any semblance of credibility Ducky...
I'm a fan of the PT and quite dislike the ST (mostly TLJ, which IMHO is simply a bad movie, but even worse, it's a bad SW movie), but while I understand where you're coming from, it just seems to me that you have no appreciation not only for classic movies and their different aesthetics, but also for George Lucas' intention.
IMO, your critique of the Vader/Ben fight is akin to saying Sonny's death in the Godfather is awfully made. Both scenes are of product of their time, of the aesthetics and constraints of the time, and they work fantastically well. The SC38 fan-made short is fun to watch, but it completely misses the tension and gravitas of the original scene. I'm a big fan of the more kinetic and fast light-sabre fights of the PT, but those have no place in the OT, for a number of reasons which I won't go into here, but have been discussed ad nauseam by PT/OT factions.
As for FX, again, these are a product of their time, and while I like most of the enhancements and revisions Lucas has done to the OT's FX, dismissing them is like saying Harryhausen's stop motion is crap because it's not as fluid as CGI. That's absurd. Matte painting, stop-motion, in-camera optical effects are as much (if not more) art forms as CGI and should be enjoyed as they were intended. It seems to me you're just equating "new" with "good" and "old" with "bad".
And acting, well, it's always been iffy in George's movies, but as ZE_501 pointed out, we don't know how much is poor direction/acting and how much is precisely what Lucas wanted to achieve. Whether it's true or not, Lucas has stated that the acting and dialogue were intended to be like that because he was trying to convey the same type of feeling that the old serials had.
Now, I quite like The Mandalorian, and look forward to more of it and some of the new series that Disney has announced, but as good as it is, I do believe we'll have to wait a few years before passing final judgement on how good it actually is. Right now it's riding a crest of popularity because it managed to do what the ST miserably failed to do: create compelling characters, use old characters well, and expand the ideas/themes of the OT and PT without falling into pure fan service.