Honestly, I may be overstating things here, but I thought it was awesome. To me, it was potentially better than all the other Disney Star Wars films thus far. While I thought Rogue One was really solid, I felt there were pacing issues and some draggy parts. Namely, the scene right before when Mendelssohn confronts Mads really just feels like it goes on forever and it's only five minutes (where Diego Luna and Riz Ahmed have to scale a mountain). It's a small gripe, but both times I watched it in the theater, I recall just feeling a lapse in momentum right around there. Overall, it was very well done and entertaining to me though. I liked the nostalgic fun of The Force Awakens.
But what was really cool to me about Solo was that it felt like it was paying homage to Star Wars while also telling a fresh story. I liked almost everything- Han's backstory with the sketchy Corelia planet and the wormlike crime lord, his joining the Empire and you getting a real sense of how the rank and file guys were just fighting for a cause they were not on board with, the introduction of Harrelsen and his team, the first meeting with Chewie, all the interaction between Han and Chewbacca, Chewbacca having a far bigger role than in TFA or TLJ, the train heist scene was awesome, Glover as Lando, etc. I dug Emilia's character too. There was a cool sense of ambiguity to her.
But I particularly thought Bettany killed it as far as supporting cast went. He really did a great job with that characterization- came across like an affable guy it'd be cool to have a beer and shoot the shit with, but who could turn with venomous vitriol on a dime. Good stuff.
I'm a bit bummed it did poorly because I think the TLJ backlash and franchise fatigue cost it when it actually deserved a wider audience.