You know, I think you're coming at it from the wrong angle.
First off, you come across as someone who absolutely didn't want it. Me too, honestly, I didn't like the concept at all.
But then you fire off all your cylinders as someone who hates this with a passion, almost as if you went into the cinema with a desire to shit so hard on this film, it was bantha poodoo before it was even able to convey one frame of information.
Was it the best? No, not by far. But was it up to Star Wars par? absolutely. People of your kind tend to praise the OT like it was the best thing to happen to cinema ever, but also tend to forget that the PT is by all accounts, also Canon. As is all the new moview happening right now, and, judging by all now 10 movies, this felt a lot more like "Star Wars" then the PT ever did, regardless of what 2 movies you'd prefer over Solo.
I won't go into too much detail, because I'm not putting spoiler tags into it, but as far as character development and writing, this one does a helluva better job than the stale performances and lines of the OT, and while the story isn't at all neccessary, it sure as hell delivers a much more solid story and plot than AOTC/TPM/ROTS ever did.
What I'm saying is direction and script is key, and simply because Lucas didn't write or direct Solo, or R1, for that matter, should automatically make it better, but, just so turns out to; it does.
Now, I'm not getting into a debate whether or not your personal opinion is sound here, I just think from a cinematic/screenwriter/director point of view; you're wrong.