You have to look at the facts here.
Disney is not in the business of taking risks or making good or challenging movies when it comes to Star Wars now that they own it, the bottom line is that they want to make as much money as possible.
They are quite clever. They make a Young Han Solo movie, and know the gullible fans will eat it up whether it is good or not. They can estimate that the movie will make a good tidy profit, even if word of mouth is bad, as opening weekends will be huge for anything star wars related. You can put your mortgage on it.
The casting that we know of is completely wrong according to many, with the lead actor, the casting of a short guy who looks more like Ray Liotta than Harrison Ford, and that we now find out has needed acting lessons while on set.
If that is isn't enough to worry people, then nothing will. Its even more surprising given that Alden Ehrenreich was considered some sort of young acting God and one of Hollywoods rising stars and all people kissing his backside like he was Al Pacino or something. We could be proven wrong and he may turn out to be a Brando, but its looking unlikely.
Also, the snobbish nature of some suggesting that that the impressionist guy wouldn't be able to play the lead character is a bit laughable, given that we aren't exactly dealing with high art or quality films here in this current iteration of Star Wars. We are dealing with cheesy and fun popcorn movies that require no thinking or effort on the audiences part. The type of audiences for these need to be spoonfed everything, so snubbing a potential option of actor because they are an impressionist is a bit sad really. There are many actors working today who also do impressions, and besides everyone has to start somewhere. I'm pretty sure Mark Hamill wasn't a known actor before Star Wars, as was several others.
With Ehrenreich, It looks like a case of casting couch events going on here. I wouldn't be surprised given how seedy Hollywood really is.
Hopefully Ron Howard has salvaged something watchable out of this, the majority of his work is quite good.