There was no joy in the movie...
It felt (to me), that the writing and directing were devoid of warmth and emotional intelligence.
It was a sad celebration of gore, with the moral compass spinning wildly.
I couldn't hold any interest. The dialogue was weak. The story was f**king awful. The characters generally hateful.
Anything with Harley-Quin in it, is almost certainly destined for emptiness and a shallow, perverse celebration of mental illness, which is portrayed by the director completely unrealistically.