They pushed a silly Mary Sue to the front (because womyn am invincible and the force is female), and they treated Han and Luke pretty spitefully.
This could be overlooked as just bad writing (because the sequel trilogy, however much money it made, was a production nightmare and wasn't the most coherent piece of storytelling). But, I mean, the
feminist angle was pushed
pretty heavily, and Kathleen Kennedy didn't exactly veer out of the way of that perception.
If not for the Mandalorian, the trilogy might have destroyed the franchise.
Solo sank like a rock, and future projects were in an uncertain place for a while. The trilogy was a blockbuster success in North America, for sure... but it did hurt the franchise.