When I saw the first promo of this series, I wasn't sure what to make of it. I was a big fan of the batman the animated series back in the 90s and guess at first I was basing a lot of my preconceptions off of that, so I saw this series taking a more humorous take on the characters and setting and wasn't sure how it would fair.
Turns out, its actually pretty enjoyable. The writers said they wanted to make a series based on harley quinn dedicated to actual fans of the characters, without restraint in how they tell a story, just goofy, over the top fun without network bullshit getting in the way.
This is something I often find with DC comics. When it comes to their movies, they've really been hit or miss, can sometimes produce gold like batman the dark knight, aquaman and wonder woman, and then produce complete shit like justice league, suicide squad, green lantern and Jonah Hex.
Their animated movies and series however is often rarely bad, making some good quality stuff like say batman the animated series, justice league unlimited, batman beyond, young justice and so on. And I'd count this as one, just a series that you don't have to take seriously as some of the others and just over the top fun.