The Star Wars Sequel movies had far better production value than the Prequel movies.
George Lucas does not know how to direct a movie. He does not know how to use a camera, effectively use CGI, cut scenes together, or pace the story. All of this was put on terrible display with the Prequels. The CGI sticks out like a sore thumb; scenes drag on far too long and the cinematography doesn't hold up to modern standards. The Prequels simply suffer from poor design. On the other hand, the Sequels have top-notch production value. They're visually stunning, and they blend CGI and practical effects well. Just look at the lighting of the forest battle between Rey and Kylo Ren in The Force Awakens, or the brilliant starship ram in The Last Jedi. They also strike a balance of lingering on important conversations and jumping into intense battles. Where the Prequels failed to capture both emotion and action, the Sequels succeed; as shown in the compelling conflict between Rey and Kylo, wherein they clash in word and deed. J.J. Abrams and Rian Johnson are first-class directors, and it shows in these films. Overall, the Sequels are better movies at a fundamental film-making level. For all the credit he deserves for creating Star Wars, Lucas had many faults that made the Prequels almost unwatchable. Directing is better left in the hands of those like Abrams or Johnson. Because of their influence, the Sequels are much more pleasant to watch.
The Sequels' shiny veneer covers up movies with no substance. The first movie was an uninspired re-skin of A New Hope. The second was a boring movie that ruined its characters, including Luke Skywalker himself. And the third was a pandering mess that tried to cover failure with spectacle. Plenty of blockbuster films look good. There are plenty of special effects and even top-of-the-line actors to go around, like in the Disney live-action remakes. That doesn't make them good movies. The same goes for the Sequels; just because they look nice on the surface, it doesn't mean they're free from criticism.