Lots of unrealistic expectations here.
It’s a modern TV series. That means generic entertainment/storyline and production values limited by time and cost-cutting. It’s not art, it’s a (more or less rushed) product for binge/consumption.
And it’s from Disney, meaning the focus is on a broad audience and merchandising. They specifically avoid complex themes and try to make things suitable for younger people (defusing tension through humor - Leia’s pursuit, redemption arcs - Reva, etc).
So it must be compared with other similar TV series, not with movies. For what it is, I think it’s really enjoyable.
So, it’s the viewer’s fault for expecting more than mediocrity. There have been plenty of great TV shows with high production values, but more importantly good writing. The entire reason for the existence of these shows is HBO pushing the envelope with series like The Sopranos, Rome, and GOT, while Netflix has also had its string of successes. Series like Cobra-Kai have shown, that you can elevate beloved and cheesy properties like Karate Kid without losing the essence of what it was about. Fans rightly expect more from series these days, because they’ve seen them done right, and not just fan service strung together by weak writing, and a distinct lack of actual story.