I think they did a good job creating the planets in the prequels. They had some pretty creative ideas overall. The trees on Kashyyyk were really cool, I liked the rock formations on Geonosis, and the cities inside the sinkholes on Utapau was neat. I also think they did a good job making Tatooine still feel like the same planet from A New Hope. Another thing I really liked was the soundscape of Courisant. The constant ambience of the ship flying past sounded really cool and it made the location feel realistic.