I saw this last night.
It was an odd experience -- I actually found a lot of the banter and scenes funny (I laughed a decent amount)... but I was also incredibly bored by the film. Which might seem odd, but I think basically there was a lot of lippy banter that was amusing, while the film was lacking an overall / big-picture impetus to make it compelling on a broader level. I just really didn't care about anything that was happening -- kind of the film I didn't ask for and that didn't really address anything I wanted to know, more of a "hey remember all those Han details? Well, we'll flesh out those things here and explain them better." I don't regret watching it, but I also have no desire to ever see it again.
Donald Glover did do a wonderful Lando, and I gotta say that Ehrenreich was fine as Han. I mean, it's not like Oscar winning performance, but I didn't see any problems with his work here and I'm not sure why some people had complained about it.
I can't say I'm a great fan of Emilia Clarke. I don't hate her, she's been in a few things I've enjoyed (including GoT) and is okay, but she's also rather bland IMO. Kind of like Ron Howard nowadays. I think Howard's heydey was in the 80-90's, where he was doing admirably consistent work that seemed more adventurous compared to all the other boomer paint-by-numbers directors out there at the time, but nowadays with lots of indie film and far more daring stuff coming out, he's just pretty vanilla.
Of course yeah, there's the "shocking" cameo at the movie's end. But more of a "yeah, whatever," because what bearing does it really have on anything currently happening in the SW universe? Unless they have future plans for him? (but of course he doesn't appear in the original trilogy nor in the most recent one either.)