Joseph Howell’s review published on Letterboxd:
First thing's first, a confession: I'm one of the people who thinks "Rogue One" is the best of the newer "Star Wars" movies. I know, I'm in the minority, but keep that in mind.
That out of the way...how was "Solo: A Star Wars Story"?
It was...whatever. Some of the performances are good (Glover being a standout, Emilia Clarke being pretty good and Woody Harrelson being Woody Harrelson in a "Star Wars" movie), the second act has some enjoyable moments, I dug the score and the direction isn't incompetent.
On the other hand, the directing is extremely workman like (it occasionally felt like Ron Howard must have been bored making it), it looks really muddy, some of the CGI is iffy, there's a twist near the end that made little sense to me (if you've seen this, you'll know what I'm talking about), Alden Ehrenreich isn't awful, but still isn't very good and by the time it ended I found that I couldn't care less about much of what just happened.
I think a good comparison to it would be "Episode III" in that it isn't the worst movie imaginable, but you end feeling uninvested in it by the time it's over.