I don't understand rating either of the two recent films ahead of Return of the Jedi. Yeah, it's the weakest of the original trilogy, but it's still part of the trilogy and has 75% of the magic of the first two films, IMO. Do TFA and R1 have 75% of the magic of ANH and ESB? I liked R1, but I wouldn't say that it's even half as magical or good as the originals.
RotJ gets criticized for the Ewoks (which I liked as a kid, but can understand the turnoff), the Death Star redux and slave Leia (again, never a complaint here). Those may pull it down from the perfection tier that the first two films were in, but I think that people nowadays tend to get so focused on those blemishes that they forget how much fun the rest of the film is, from Jabba's palace to the speeder chase and forest battle to the final duel between Luke and Vader to the epic final space battle. Were the best scenes in TFA and R1 even half as fun or memorable as those?
I just think that RotJ gets a little unfairly judged because it's easy to compare it to the first few films and come away with the thought that it's the weakest, while the two new films compare even less favorably to the first two, but have the benefit of 35 years of separation and filmmaking improvement. If one would prefer to watch TFA or R1 over RotJ, that's understandable, but I don't think that it means that they're better films, rather that it can be easier to watch an imperfect film that's 30 years more modern.