Yoda was clearly more skilled with a lightsaber and more powerful with the Force than Dooku. I think it was close between Sidious and Yoda on both fronts, it could have gone either way but indeed the fall was the difference(?) Sidious got the upper hand and Yoda knew he would never get another chance. "Into Exile I must go". With Windu, Sidious was the more powerful Force user but Windu was the more skilled saber fighter and had Sidious dead to rights; Anakin coming in gave Sidious an opening that he took full advantage of. I think the Force Lightning damage Sidious took was intentional but I think Windu legit beat him in that moment. It very well could have worked out the other way, too but Sidious as all powerful is way less interesting to me.
For RotJ, I hated the Ewoks in the theater, I was 12, fuck those muppets. Everything on the planet that involved people was OK, muppets sucked, On the Death Star/in space was awesome. Lucas going back to the well with Death Star 2.0 was meh but why reinvent the wheel if your wheel is awesome. It was a little disappointing at the time but everything else was so great that no one cared, really. The Luke/Vader stuff had so evolved, so much growth it was really incredible at the time. Here was Darth Vader, the baddest MFer in the galaxy, and there was someone HE was subservient to? God the Emperor was so awesome in 1983. I've written about it before but when Vader threatens to turn Leia, and Luke shouts "NEVER!!!" the music swells, I am forever a wide-eyed kid in Beaumont, TX watching that for the first time. It's just...so affecting to me still. It's dumb given that it's not Shakespeare but these movies are not classic literature but it is very archetypal. We have seen Luke the Naive Farmboy who wanted to go to Toshi Station with his friends (pour one out for Biggs!) to get some power converters become Luke the Jedi Knight, meet and surpass and redeem his father, confront the Emperor, Destroy a Death Star, and defeat the Galactic Empire. An Empire which everyone said later was the Nazis but to me as a kid, the only Empire I knew that wanted to blow up a planet was The Soviet Empire.
Star Wars was not a Kids movie; the first time anyone said that was RotJ with the Ewoks. EVERYONE loved it. That was a huge point of contention around the prequels. There was a bunch of kiddie shit there that was never before in a Star Wars movie. Luke was on a Hero's Journey that appealed to all ages. The Toys, where Lucas made a mint, was all kids but the movies themselves weren't aimed at kids at all. Obi Wan seemingly more or less gets chopped down/disintegrated as we end the Second Act. How many Kid Shows pull THAT off? Lucas came out with a 9 year old protagonist (as opposed to 17+ year old Luke), pratfalling Jamaican aliens and farting camels and the rest is history.