Hello :)
-Mind Trick: It's a part of my "Stormtroopers kinda suck" problem. Although we can assume that Obi-Wan persuaded whole group, it still is just an assumption, and while I can accept it for explanation, there still are moments like "locked door" or inability to deal with a primitive tribe. The point is... Stormtroopers kinda suck, yeah... :)
-Although it doesn't bug me too much with uniforms, still, there are hundreds if not thousands of troopers on DS. They don't use clones anymore looking at all 6, and if we just look at OT it only adds up to it: it's unlikely that every Stormtrooper knows each others face, so might be useful even without helmets (or could get them later). Could at least try to be all "yeah, here they are, we caught them, let us take them to cells" or something. :) But I let this one slip, it really doesn't bother me to be honest. After all these are sci-fi adventure movies, not stealth spy or something.
-The swords: Yeah, clearly the Force improves their performance so they could use sword against guns. But originals don't show it nearly as well as PT. Lukes opponents with guns were "drunk" Boba and Stormtrooper (who are separate case), we also see Vader using his hands to block shots, which is cool, but 1)he is "level 80 dark lord" 2) he has only 2 hands, what if there were many guys shooting at once? Say whatever you want, but in PT, when we see Jedi taking out their lightsaber against a group (not an army like in II or III) of regular opponents with guns we're like "oh, guys, you're screwed, better drop guns and give up". Just on their own Originals don't give enough to clearly see that Jedi with a sword can kick major @ss against guns, we mostly assume it. So the actual "complain" is that it would be nicer to see real "Jedi at work", whether by Obi-Wan (when he was still alive) or by trained Luke, not for the sake of pure action, but to see how the hell did it work in the old Republic.
-Walkers: Yeah, why not something flying, or something with wheels? Something that can't be taken down by a rope. Also rebels say that Walkers armor is too strong for their blasters, but apparently it's not once the walker fell down, which is strange. But lets be serious, the real reason is that these machines look cool, like something non-Earth, something more alien. Movies are entertainment after all, even when they are thought provoking.
-Yoda: Surprisingly I get this part the best after watching Prequels and Clone Wars (Season 6), because Originals state that there's this cave that is strong with the Force (Dark Side in this case), they don't really state that entire planet Dagobah is strong. Yoda, living among such concentration of Force is invisible for Sith, keeping himself as one of last Jedi, as a teacher for Anakin's children. But I base this greatly on Prequel storyline. With Originals one can assume that Yoda is pacifist (as you just did) or too old (but isn't it just a body, which shouldn't matter?). With PT and CW we see that only Yoda and Kenobi were able to become Force Ghosts (Jinn was mostly just a voice), and that it was a rather new thing and thus they couldn't guarantee that it'll work, thus Yoda needed to be alive to teach for sure. If we had only OT it'd be safe to assume that all Jedi can do it. And if so why not spend last years of your body's existence to help fight the evil (not take down the Empire, just help; he was "a great warrior" after all) and then train Luke as a ghost (Kenobi was totally capable of providing wisdom after his death). So this complain is not a complain within full saga, but if we take only the OT, then it becomes a "head scratch".