The Sequels added to Star Wars in a way that was poorly executed. Its post-Original Trilogy setup was just the Original Trilogy all over again: an evil government and a rebel group, using the same weapons, ships, and uniforms as the original players. Their character exploration was poorly justified. Why does Han Solo, a new hero of the Rebellion and the spouse of royalty, go back to smuggling again? Why does Luke Skywalker, the most optimistic of the Jedi who redeemed Darth Vader, try to kill his nephew? And the Force powers they introduced ruin the concept of the Force. Force healing cheapens the deaths of all the Jedi who came before, and died because Disney hadn't written Force healing yet.
The Prequels created a universe that was markedly different from that of the originals. They introduced real, living worlds, entirely new villains, and visually unique characters. One would think that the Sequels, taking place after the original trilogy, would show how the galaxy had changed. But instead, they ended up reusing the same basic formula, and missing badly when they tried to innovate.