Went and saw this tonight.
Sadly, it probably deserved some of the poor critical ratings, mostly due to hap-hazzard way they introduced the characters, plot holes, and I thought they struggled with blending and gelling such a large cast.
Still... it did exceed my expectations (they were low!)... I had hoped for a decent level of development between Harley and Joker, and in that regard I felt Jared Leto, and Margot Robbie delivered.... i'd have liked more, but it was adequate.
DC movies are always so Dark... they need to get off that band wagon IMO.
I def would like to see a Joker / Harley Quinn spin off.