I don't think Rian hates ESB but he is missing the point of it. He thinks that the heroes just losing in the end is cool without knowing why it worked in ESB.I think you are understating a bit how (to a normie movie watcher) bad ESB was for the Rebellion.
The crawl informs you despite blowing up the Death Star they've been forced off Yavin IV. They are scattered and forced to try to set up a base on a damn ice planet because that's the only safe place; and they've only just barely got it semi-operational before they're forced to abandon it again. They get their people and presumably most of the most valuable equipment away, but that's still a lot of hardware (not to mention sweat & blood) they've been made to leave behind.
So having just gotten fucking served and chased off another planet with what look like fairly heavy casualties, Luke our hero, the most kick ass guy in the Rebellion who took out a fucking 80ft walking troop transport solo and ON FOOT after his snow speeder was shot out from under him, goes and has real jedi training.
The Falcon is in sorry shape and they can't even jump to light speed, and Hans our smart & clever rebel, is betrayed and he and Leia (our stand in for leadership of the Rebellion) are captured.
So Luke, freshly amped up and empowered from his training montage, suits up and goes to rescue them. He encounters vader who proceeds to not only kick Luke's ass, but reveals that he is Luke's father, making things even worse. The guy who killed your father figure (Uncle Owen) and then turned your replacement father figure (Obi-Wan) into a blue-tinted ghost in a bathroom, and who is also Space Hitler But More Evil, is your actual absentee father.
(also demonstrating that you got your ass solidly whooped and he was purposely taking it easy on you)
So the movie ends with Hans captured, Luke the most powerful guy the rebellion has is completely beaten - hand removed, light saber lost - the Empire overrunning Cloud City, the Rebels without any (in movie) bases. Shit's bad yo.
But at the very end of the film, you see Luke with the rebel fleet, getting a new hand, being determined to complete his training, rescue his friend, and face down Vader; Lando joining the rebellion and going to help find Hans. Things are bad, but they aren't hopeless and they're looking up.
Ruin Johnson's just salty because ESB actually accomplished its story telling goals, and his was a nonsensical pile of flaming garbage trying to shamelessly copy something better.