I've seen it twice now, and I like it a lot. Flowed a lot smoother the second time, I admit that at the first viewing the last third after the Kessel Run seemed to lag a little bit. Theater was completely sold out both times, in a pretty large theater in OC, so did not experience the half full theaters many of you said you did.
Very enjoyable movie, clearly tons of stuff thrown in to please the longtime fans that consumed everything book/lore/toy wise they could growing up. There were dozens of tiny details that tied into previous SW legends/lore.
Highlight for me was the Enfys Nest showdown near the end on Savarine. First off I love the character designs of her whole team but her most of all. Very tribal. Felt like a little Mad Max meets SW. I loved the old west showdown feel, and the musical score for her crew was my favorite in the entire movie, with the reappearance of the asteroid field chase theme from ESB being used during the Kessel Run a very close second.
Most jarring thing for me was Paul Bettany. His acting was fine, but his voice is so tied to the Marvel universe for me that it threw me off both viewings. I think every other actor did a great job, new Han is totally fine, Donald Glover was fantastic as expected, and Joonas is really owning Chewie.
The young girl leading the rebellion thing though was pretty lame.
I understand your point, but she wasn't leading the whole rebellion, she was leading an isolated piece of the Rebellion as a whole, on her planet, precisely like the Ghost crew was doing on Lothal in Star Wars Rebels. I felt like they pretty clearly showed that this small crew was doing what they could on their planet, where "marauders had come and cut out the tongues of everyone" and Enfys had taken up the cause of her mother, with an eye toward procuring the means to further the larger Rebellion building in the rest of the galaxy.
Anyways, liked way way more of this than I even slightly disliked. I love that this one more than any others clearly tied in the animated Clone Wars and Rebels, especially with the big cameo near the end.