Solo: A Star Wars Story is a decent movie. Not a great one, as I suspect many fans were hoping; and not a terrible one, as much of the Internet would have you believe.
Solo is an origin story for Han Solo, that lovable rogue from the original Star Wars films. Starting from his lowly origins as a orphaned urchin on Corellia, Han talks and fights his way into and out of any number of improbable situations on his way to becoming the smuggler we know. Along the way we see him meet Chewbacca and Lando Calrissian, and of course find the Millennium Falcon.
I went into this expecting to see how Han met Chewie, and maybe some other stuff. Which is pretty much exactly what I got out of it. Just about everything involving Chewie was great...I particularly liked that he rescued another Wookie at one point...and the rest of the movie was decent, but nothing spectacular. They filled in a few gaps (like what exactly the Kessel Run was) and expanded on the smuggler's underworld that Han inhabits. Sure, there were some silly bits (like making the marauders into a proto-Rebellion) but I'm used to that with Star Wars. (Midichlorians, anyone?)
I didn't think any of the actors did an exceptional job, but none of them were terrible either. Donald Glover was the best of the bunch as Lando, but his role was too minor to really stand out. Alden Ehrenreich is no Harrison Ford, but that would be true of just about anybody, and I thought his Han was solid but not particularly noteworthy. Neither Woody Harrelson nor Emelia Clarke impressed me much with their performances, but it's not like they were terrible. Just kinda mediocre.
The writers clearly tried to interject some social commentary into the film, most notably with Lando's droid L3-37 (oh, haha, what a clever name) agitating for droid rights. Which, in my opinion, fell completely flat because they couldn't decide whether it should be a serious issue or comic relief. Going back and forth between the two failed miserably.
There's been a ton of angst all over the Internet about how Solo had a poor performance at the box office. I doubt Disney is losing much sleep over that, because they're still going to make millions overall (merchandise, DVD sales, etc). And even if they do lose some money on this one, the Star Wars franchise isn't in danger any time soon.
For Star Wars fans, it's worth seeing Solo for a bit more story about characters that you already know. You'll likely have a good time watching, but I doubt you'll find much that stands out.