It's -decent-, hit-or-miss I'd say.
It can be really funny at times, and most of the side characters like Clayface, King Shark, and Dr. Psycho really carry the show.
Even Ivy, who's wildly different from any of her early incarnations, can be quite amusing, even if she's pretty much green Daria/Jane.
Unfortunately it's Harley herself that I have the biggest problem with, which is a shame since she's the central focus of the show.
She's got the least funniest jokes, almost everything that comes out of her mouth is just awful.
And she's such a shitty person, and not even in a fun-to-watch way.
Because she's so insufferable it's very hard to want to follow her or care about what happens to her.
I care more about fucking Kiteman than I do about Harley.
Also the series often falls into the common "adult show" traps of shock humor, gore, and lots of swearing.
The writing can be pretty inconsistent too, with character traits switching on a whim to suit a gag.
Jokes should work themselves around the characters and their quirks, characters shouldn't be sacrificed and warped for the sake of a joke.Also they only put int one Harley butt shot, the fucking teasing cowards they are.