The Kreese and Silver ending was perfect. Both guys were pretty much irredeemable so ending each other when they're both old AF and ready to step down anyway was good. At least Kreese made peace with Johnny and handed over the keys to Cobra Kai which is what needed to happen.
Sam retires from fighting because she's too fat. Yeesh I guess it kind of works. I still can't understand how the actress didn't even pretend to get in shape for the role after season 2.
The guy they really did dirty was Axel. He's just a well-meaning kid who's been manipulated his whole life by his asshole sensei. He could have been world champ but refuses to sweep the leg against Miguel because he has feelings for Sam. So he loses fair and square, takes it in stride, gets the Kreese-Johnny parking lot treatment from his sensei, and then just walks away and we don't see him again. They should have shown him walking up to Cobra Kai/Miyagi Do at the end looking for Sam/seeking a proper sensei so we know he didn't just blow himself up on a boat somewhere.
Johnny got the redemption arc he needed and Daniel coaching him off the mat was pretty great. "What dojo are you fighting for? Does defeat exist in that dojo? Now stop acting like a little pussy and go beat the living shit out of this asshole" was spot on perfect. The only thing that would have made it better is if Johnny had actual history or beef with sensei Wolf. We don't really know anything about him other than he's a dick and he ate the last two pieces of steak at the hotel in Barcelona. I guess that kind of makes it more hilarious which could be what they were going for.