These last few years we saw many special and different superhero movie that are not all about the good guys.
Things that come to mind besides Suicide Squad are these:They were mostly successful and because of that is nothing weird somebody decided to take bunch of anti- heroes and make movie about them.
I don't want to spoil this one too much because it just got out not a long time ago.
Soundtrack is amazing and Harley Quinn is amazing. If it weren't for here this movie would flop.