Despite what you have heard this is not a bad film. It's not a great film either. It is a flawed film, but it's a fun flawed film.
Rome Girl's comment was "That was a great summer blockbuster. It has issues but it was really fun."
And that comes from someone who isn't invested in these characters at all and doesn't care about comic books. In other words from a "civilian" perspective it works, really, really well.
Deadshot, Harley Quinn and Enchantress are the best parts of the movie.
The worst parts of the movie are:
1. A very clunky introduction of the characters at the start of the first act.
2. Viola Davis giving the worst performance of her career.
3. A plot twist at the end of the second act that is a huge clunker and the one point where the writers fail. (Thankfully, this is completely saved by a flawless third act.)
What will put some people off is that while the film is very true to Harley's character, it is not 2016 Harley. It's Harley when she was still in love with Joker. I don't have a problem with that because being in an abusive relationship has always been a part of her story. She can't become the abuse survivor she is today if she was never an abuse victim in the past.
They do give Harley a hell of a lot of agency when she's away from Joker to balance this out. In the end she is the most powerful member of the Suicide Squad pulling off stuff the boys aren't capable of doing despite all their guns.
Will Smith has some great moments as Deadshot. He does what he's there to do - be Will Smith with a gun so that the majority of America who does not know these characters has something familiar. And Will Smith shooting people while making wisecracks is almost iconic at this point.
Enchantress is also better than I expected. That's not saying a lot because, honestly, other than Loki, most bad guys in recent comic book moves have ranged from boring (James Spader) to fucking awful (Jesse Eisenberg.) But at least she's three dimensional and interesting beyond just "we need to kill this person."
Joker is sort of meh and exists solely to give Harley an origin story. I haven't processed yet how I feel about the origin story they give her this time around. It has elements of both origin stories we've seen before but has its own take on it.
It is certainly better than "Joker throws her in the goop." Is it without "issues?" No. But how do you make an origin story about a powerful abuse survivor that doesn't have issues? It does give her an element of choice and agency, which I'm happy with.
Anyway. Go see it with an open mind. There are clunker moments, but there are also a lot of fun moments. I think time will be very kind to this movie - which is a million times better than Superman Vs. Batman and certainly better than any DC movie yet.