THIS IS MY OWN OPINION
Liked it. My first reaction upon leaving the screening? Well, that was a blast.
In context with the DC "universe", obviously it takes place after BvS. Few references to Superman and easter eggs of course.
How was everyone?
Character wise these are the standouts to me: My favorites have to be Joker and Croc. Quinn was great as I expected. Boomerang, Katana, Diablo I liked in their respective personas. Deadshot didn't make a huge impression on me honestly (he had some really cheesy lines though LOL). Chemistry wise the Squad is very very solid, though there was this one "relationship" in the movie was about as convincing as a brick wall and a car making love. Did not work lol. Costumes were cool all around.
Leto pulls off his Joker fantastically. Maybe too well. He's insanely scary sometimes. Robbie HELL YES PERFECT. Will Smith as Will Smith says hi. Even Courtney managed to work out. Davis makes Waller.
The movie had a sort of a serious gritty tone but there's humor as well. Pacing was nice, movie felt like it flew by to me. Maybe a little too quickly. Action was done well. No stupid shake-cameras-till-your-head-hurts moments. The music was a nice mixture of familiar songs (trailer music is in for example) and of course the movie soundtrack itself. Though besides one or two pieces the main score didn't really stand out to me which is a shame because really liked Price's previous work.
Compared with marketing? Joker is being overpromoted compared with his respective screentime in the movie. And the film is not as wacky as one would assume from the marketing. Batman shouldn't even be in any trailer honestly since he wasn't exactly a main character but he definitely had his moments . The CGI got changed quite a bit from a few trailer scenes (like the chopper). And much of it was improved as well obviously.
A friend of mine said he liked it as well. Though this guy isn't a comic book movie fan, so I refrained from hassling him about the various aspects of the film. The screening was about half full.
If you're expecting an oscar winning movie go somewhere else. If you're expecting a fairly straight forward competent action comic book movie with a gritty tone and some cool characters, sure this movie might work for you. If you're expecting a carbon copy of say a typical MCU film, yeah this isn't it either. I give props to Ayer.
Really liked it and looking forward to seeing it again. Maybe as a comparison: TDK > SS. BVS < SS. MOS < SS. Not sure if I should give it a rating. Might change expectations.