Despite sudden shifts in tone, hollowed out antagonists and the overwhelming feeling that you were watching two different movies crammed into one, Suicide Squad does one thing really well and that is to help establish the wider DC Extended Universe. Marvel Movies have had one consistent problem, the villains are caricatures with very little motivation. By releasing Suicide Squad before Justice League, the shepherds at DC are attempting to build fleshed out villains who have very real and sometimes sympathetic motivations into this universe. When audiences are able to relate to the villains or antagonists, the stories that a studio are able to tell can be more fully fleshed out and fulfilling to audiences seeking a more grounded or “real world” type of “SuperHero” film.
DeadShot and Harley Quinn carry the film for the most part. Both characters have realistic motivations which allows audiences to engage emotionally with them and attempt to see things from those characters’ perspectives. DeadShot’s relationship with his daughter and the toxic connection between Harley and Joker are storylines which can be expanded upon and allow for some great interactions between these characters and future Justice League members.
The main antagonists, Enchantress and her Brother(“Incubus” from the comics) are basically plot devices. Incubus has maybe 3 lines of dialogue throughout the film, if that. Amanda Waller and Joker are much more “appealing” villains and this is a problem because that was not the intention of the filmmakers. 
Suicide Squad was an ambitious move for DC, it did not hit on all cylinders but overall it is a pretty good comic book movie and I would recommend checking it out.
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