Suicide Squad (like it or loathe it) did a better net profit than MCU Dr Strange & BvS.
It was fun. A good comic book movie that resonated with audiences. Yes, Robbie stole the show, but can that really be a surprise? HQ is very well known, she gave a great performance, and she looked hot. (Yes, this is Hollywood and sex sells, it’s a fact.)
It has earned a sequel by virtue of its net profit, if for nothing else. And the nature of Suicide Squad is that you can swap out characters. So don’t return Deadshot, since Will Smith has said he’s not returning. Plenty of incarcerated villains to choose from.