So I have now seen this. My thoughts. Anything spoilered is done so because it's actual spoilers.
I enjoyed it well enough. I give it 3/5. It's hardly high art but I got a couple of laughs out of it. The ending is one of the dumbest things I've ever seen committed to celluloid but that's okay! If you're going to do this particular villain (Starro the Conqueror) you pretty much have to embrace it or choose someone else. The director embraced it.
I'm not usually a fan of needless gore but in this case it's pretty much a key part of the aesthetic. John Cena managed to get through the entire movie without sneaking in an apology to China and Idris Elba is frankly above this sort of thing but hey, a paycheck is a paycheck even if you're a backup plan for if Will Smith chooses to come back (which is kind of offensive, racially speaking but whatever). It's vaguely amusing when the villains and others keep referring to "the Americans" when Elba is British, Robbie is Australian, Rat Catcher is Portuguese (both character and actress) and King Shark is, well, possibly technically Hawaiian which might be "American" by dint of occupation, I suppose. I didn't notice anyone least of all Elba changing their accent to an American one but I guess I can put it down to the henchpeople just assuming the squad are American. EDIT: Polka-dot man is American. I'd almost forgotten him. He's good and I like the whole Norman Bates thing he has going on. The viewpoint moments from him were funny (He sees everyone as his mother. At one point you see the whole cast with his mother's face morphed onto them.)
Lets address something of concern to the culture warriors here. It's not a noticeably woke movie nor "a Harley Quinn movie". I ain't budging on that. She gets no more screen time than Elba's character, possibly less. And whilst Birds of Prey (which I never saw) might be criticisable for a thin woman beating up scores of big muscular men, this movie is a movie where people literally shoot bullets out of the air and kill people with absurd trick shots that could only exist in comics. Is there a corridor scene where Harley kills a dozen guys? Sure. Is it out of place or any different to what the other characters are doing? No. She's one of the main characters and very popular. She gets an appropriate amount of screen time and abilities for that.
Rat Catcher. She's great. Astonishingly and heart-breakingly pretty and charming, despite being covered in mud or asleep for half the run-time. She has great chemistry with everyone else on the squad, including the CGI King Shark which is impressive. Is it wrong that I ship these two? (Narrator's voice: "Yes"). King Shark is pretty much like the comics version. He doesn't sing "I'm a Kiiiiiiiing Shark" sadly, but is otherwise fun. She reminds me of a young Lacy Chabert or Mila Jovovitch.
Criticisms: The movie is too fucking dark. I came out of the cinema with eyestrain almost from all those night scenes. Also, give Peter Capaldi more to do. I was worried at one point he'd have next to nothing at all but he does get a couple more scenes towards the end. Still a waste of his talents, though.
Subverted expectations: I think some people are expecting this to just be a DC Guardians of the Galaxy. Obviously you can find comparisons if you look for them. You could kind of pigeon hole King Shark as a Groot character if you squint and have a mind too. But equally if you squint he's just Killer Croc from the last movie even more so. And obviously for another parallel with GotG, these are less than moral heroes. But GotG really felt different to me. Which is good because directors often retread the same beats from movie to movie but both plot wise, pacing wise and general tone this is different. The arc of GotG is quite standard, really. Group don't like each other. Come to like each other. Face external foe. In this, there's an external foe from the start. It's a great deal less character driven in terms of plot until right near the end where it matters. Just for a start.
And it's a major improvement on the disaster that was the previous Suicide Squad movie. For me, in a sea of mistakes and bone-headed ideas and lines, the most memorable dumb thing for me in that movie was HQ smashing a window to steal a purse and going "Duh, we're bad guys - it's what we do" in that smug tone. There's nothing comparable in this movie. The characters are actually allowed to be awful rather than heroes with a Hollywood-level of "villain hat" stuck on them for the sake of it. Yes, there are little passes built it in some cases to allow them to not be wholly irredeemable but there's nothing as egregious as having HQ steal a purse to establish to the audience that 'these are really bad people, honest.' Another case in point, the previous movie had that bar scene where they speak about how they're villains but are going to do the right thing. There's similarly a bar scene in this where they bond, but it's so much better and believable.
Final thoughts. I said this wasn't a woke movie. It ain't. But it goes a little bit further than merely not being woke if you want to get into politics. Specifically there's a twist which if I'd had higher expectations of the movie I probably would have seen coming but as it was, I didn't, and it was a nice surprise. I wont give it away but I'll comment on it in a spoiler for those who aren't worried it will clue them in. Lets just say that it has some interesting parallels to Covid-19 and the lab-leak hypothesis. It's a fairly clear political analogue to that as well. Frankly, I'm semi-surprised it got through and attribute that to either TPTB just not caring about some 'dumb action movie' or that the writing and filming was done long enough ago that it wasn't expected to be an issue. But frankly, the timing on this couldn't be much better given what's going on today.