What made the original trilogy great was that it was a solid action/sci-fantasy story. Basic plots but great fun. The downfall of the later movies is that they all tried to be something more and explain a lot of the backstory and lore. And that's pretty much true for most of the great action movies of the late 70's through the 80's.
Yeah, agreed. Lucas was inspired by a whole range of things - Kurosawa, Flash Gordon, westerns, etc. SW is a straightforward good and evil tale with what was then a unique and dazzling spin. Then Empire came along and just told a damn good story while putting its characters through the ringer.
JJ Abrams' inspiration for TFA was... the original SW trilogy. Lucas may have gone mad during the prequels with things like Jar Jar and midichlorians, but those movies at least feel like a separate set of films with a different vision albeit tied to the OT as a backstory.
JJ is a better producer than director. The closest thing to being a trademark of his work is lens flares. TFA is an entertaining movie with great characters, but I cooled off on it after subsequent viewings. Then TLJ came along and shat on everything.
As for the MCU, while those movies are well-made and entertaining I find them utterly forgettable. They have a good thing going and have benefited from having Feige as the overlord. However, MCU movies are like live action adaptations of cartoons, which isn't necessarily a bad thing, but nothing sticks with me personally. Watch, enjoy, forget until the next episode.
I'll mention RoboCop again. It's a sci-fi action movie that tackles all sorts of topics such as mass media influence, business corruption, corporatization of police, urban decay, and so on. It has heart and emotion but also deftly incorporates dark humor and satire, most importantly NOT at the expense of the drama or social commentary (complementary to those, in fact). All of this in 100 minutes. RoboCop is a perfect, timeless movie.
Nobody will ever say any such thing about Thor 2, Doctor Strange, Ant-Man 2, etc. Sadly the new SW trilogy could end up being one giant missed opportunity and not having any kind of staying power. Maybe the other trilogy in development by the Game of Thrones producers will inject some life into SW. Or it'll be about the great grandfather of Greedo, who crosses paths with the great grandfather of Boba Fett.