According to online reviews, this is supposed to be the worst film of the decade. It's supposed to be worse than Batman v Superman.
It's not. It's not a bad movie and it's not a great movie. It's a solid summer action hit based on a cartoon. Where Dawn Of Justice was a movie that took itself too seriously on a cartoonish premise and delivered a film many people thought was simply boring, Suicide Squad is anything but boring.
This is my first non-spoilerish review on this website, and it will probably show in the manner of sucking all kinds of... Sorry. Anyway, let's go over the faults first.
There are two gripes with this movie from my perspective, and that's the perspective of someone reasonably familiar with the source material. First of all, the exposition is a lot in the way of "tell, don't show." The introduction of the team really did get overly laborous. The pacing has some issues, but it's in no way a cinematic disaster. Second, by apparently cutting the "most distasteful" parts of the Harlequin and Joker interaction it sort of managed to romanticize the relationship. Lots of fangirls should love this but I'm very dubious against it. Ipso facto this looks like an abusive relationship that's somehow been made palatable by hiding the skeletons in the closet, and I can't understand how you could consider this more palatable than actually showing them, warts and all.
However if we go from there to the rest of the action, the movie shines.
Harley Quinn is fantastic. Margot Robbie has truly made this role into her own and I doubt we will ever find a better actress for it. Her mannerism echoes both The Animated Series and the cartoon adaptions and she's pitch-perfect. This is very important, because she's the lead character of the film. She's the one given the most screentime - even over Deadshot - whereas the Joker is a side role, who is hard to judge by this limited appearance but is at least visually appealing. Judging by that, he's the one most true to the original character since the first series, tattoos notwithstanding.
It amuses me to no end how some critics use Harlequin as an excuse in labeling this movie for being "sexist." It's like they haven't seen anything of the source material (and frankly, I suspect that might be the case.) Harley has always been a self-consciously sexual character. She's a pinup girl and she's always been a pinup girl. Complaining about that is like complaining about Poison Ivy seducing men or Batman beating up criminals.
Deadshot, by Will Smith, is also very well done - and I am saying this as someone who only enjoyed Will Smith in Ali. He's not adapting his comic character to such an extent but nevertheless he owns it, with all its important elements ringing true.
The third important role is Viola Davis as Amanda Waller, and again they couldn't have found a better match. She embodies everything we've come to expect, easily outclassing Arrow's version as the ruthless government operative responsible for bringing together the squad. Diablo, by Jay Hernandez, plays the reluctant villain-turned-pacifist. He's the most potent of the members of the squad and he's also done well but his dialog is very limited, though his CGI is pretty fantastic in the later stages of the movie.
The other parts of the squad are minor characters. You could argue Flag and his girlfriend are important but only in the sense of driving the story, as apart from that they have practically no personality. Killer Croc is visually well done but forgettable, most of the other members have few lines and Katana is nothing but an unexplored stereotype.
There are a couple of cameos of Batman in this film. These are funny because even though his screentime is almost nonexistent, I feels like the people involved with this film had a better take on him than was ever the case in his co-joint feature movie. (The scene between him and Deadshot stands out in this regard.)
As for the main plot of the movie, it's honestly pretty forgettable. It basically pits the squad against a nigh-omnipotent enemy as cannon fodder and takes it from there. However, the bottom line is that this movie works, flaws and all. The character moments work and the dialog mostly works. It's a fun ride. In my theater, people were cheering at the right time, laughing at the right time, and generally enjoying themselves. If you're expecting Bergman-level drama, stay away, but it's not as dumb as Tranformers. It's also doing all the legwork of setting up a sequel, and assuming this doesn't tank, I'm pretty sure we'll get one.
All in all this is a movie I'd recommend to any fan of the DC universe.