Just saw this today and I really don't get all the hate. For me this edges out Rogue One near the top of my list of SW movies because the story flowed better and I found I cared more about the new characters than I did in RO or TLJ and the characterisation of the familiar didn't feel too alien.
Lando's sassy female droid was a nice reflection of Legends (I know Vuffi was male) with a modern twist and also that nod to the Mindharp of Sharu was good for those versed in Legends material. Having Lando keep and then lose the Falcon while cheating at Sabacc was quite funny but the way I figure it that still leaves plenty of scope for a future movie to explain the whole "double-crossing no good swindler" thing from ESB alongside tying up that Crimson Dawn story with Maul and the love interest.
All in all I really enjoyed the movie, with the only "off" bits for me being the boss lady on Corellia (who just reminded me of the librarian from Monsters University) and the space alien during the Kessel Run. I'm surprised but quite glad that they didn't dump TFA's Maz Kanata into the second Sabacc scene although my head-canon has already turned that into her crib.
I'll put in the basics of why it bothers me.
Firstly Han now has the same problem as Rey in TFA and TLJ, he doesn't work to gain any of his skills, nor is there any deeper meaning behind any of his actions now.
Han's iconic blaster? Did you think he customized it and worked it himself? Nope, just a random drop off from a guy who put two parts together and tossed it to him. His iconic name? Nope, random officer joke, the Millenium Falcon modifications Han mentions in OT, nah those were always there apparently. His piloting skills, rather than being honed through years of experience he just sort of has, he's apparently always just been good at Sabacc, having Han actually learn and build off these elements while failing would give us more reason to identify with him as a character and make him more believable. In the OT Han has these skills but it was put in that he'd built them up after a lifetime of smuggling. Instead of a human with flaws that has that Solo charm built up over experiences, Han is now a Gary Stu.
Chewie has apparently been eating humans-let that sink in-and he spares Han because Han asks him in Wookie not to...but Chewie understands Basic...so han just asked him the same question twice.
Lando is virtually unused in the film for the most part, other than piloting them there and his card scene he doesn't really add anything to the film and feels under utilized, his relationship with the droid is-odd to say the least-though in SW there have been characters who banged droids(well at least HRD's that mimic organics in nearly every way so it makes a bit more sense) but the SJW droid just felt out of place, it had some quips I liked(like when Lando asks if it needs anything and it says, "Equal rights?") and the idea of a droid that wants equality is kind of an interesting concept, but the problem is that when it 'frees' all the other droids and they immediately begin something resembling a riot it just makes me think-well do R2 and 3PO think they are slaves? Do ALL droids just silently SCREAM and have their own sexual needs? Was there an actual point to this other than blatant commentary on an SJW trendy issue? Also why is Lando distressed when it is shot? He can literally REPAIR it, it's a droid, grab the memory unit and put it into ANY other droid, it's not like a person.(I actually laughed when he tried pulling it back in and it broke in two-I know it was supposed to be sad and serious but frankly it was humorous)
The Criminal Syndicates grip makes no sense...the Empire has taken over the Galaxy and is the ultimate expression of 'Lawful Evil" yet Imperial Governors can just be executed by Syndicate members with...zero consequence? Even Black Sun at it's height couldn't do that without consequence. Han's mentor's betrayal-while being about as obviously set up as Han dying in TFA-also makes little sense in that he could shoot the Syndicate Boss and them all in that scene and escape-which was his motivation at that point.
The Ravagers...are just...no, I mean what happened to Bail Organa, Mon Mothma and their lot founding the Rebellion(even in Canon) so these Ravagers are the Rebellion's origin hinted now?
Then finally and I say this with utter complete unabashed anger
WHY THE KRIFFING SITHSPIT NERFHERDING EMPERORS BLACK BONES DO WE NEED DARTH MAUL BACK AGAIN?!!!
What is people's obsession with him? He looked cool and was played by a kickass actor, that's IT. He has no development, zero investment and zero depth-(wait now that you mention it his popularity with the majority of people is making more sense...all style, no substance or thought required!)
We had Darth Maul light in Savage Oppress, then we got Darth Maul AGAIN, then in Rebels, now in a Film in IMPERIAL TIME? We know he dies to Kenobi, we know he has no larger effect on the galaxy, he's just mindless fanservice at this point.