I give ROTJ a B and TFA a B+ mostly because of the overall energy level. The ROTJ script doesn’t really give anyone but Luke and the Emperor much to do, and consequently a lot of the other actors sort of phone it in. In TFA, everyone’s totally into it and it shows. That might not be enough for the crowd that’s constantly pissing and moaning about the unclear political situation (a view towards which I’m sympathetic) and Kylo Ren’s unsuitability as a villain (a view I think is completely bogus), but I’ve personally always cared more about the tone of these movies than anything else, and TFA delivered on the wide-eyed enthusiasm front just a bit more than ROTJ.