Details from IMDB:
I'll say right away Margot Robbie is a great Harley Quinn. She is really the only reason I decided to see this movie after 3 weeks. Well, that and I am a huge comic book fan but I've read very little Harley Quinn, I like her as a part of the Suicide Squad and I hope that can be done better by James Gunn.
I'd like to state that I'm sure if I was a woman and a bigger Harley Quinn fan I would have enjoyed this more. I don't think that makes me sexist, just honest. Anyway, I thought this movie had some good laughs, lots of good action and some nice character development for Harley.
Everyone involved does a good job with their characters (even Ewan, though he's probably the weakest here). I also had fun with this movie, there are creative action scenes and a few good surprises.
I think the big issue is the plot. It jumps around in the time and just has several stretches where it's just dull. At 149 minutes I also found it too long and felt at least 20 minutes come have come off.
I know it's made money and lots of critics enjoyed it but I couldn't help feeling disappointed and wondering if I'd even see any more Harley after this.
DC Comics seems to have some really big ups and downs. We have the disasters that are Batman VS Superman and Suicide Squad, the amazing heights of Joker and Wonder Woman and those in the middle like Shazam! and Birds of Prey. I give this a 6.5 out of 10 and a mild recommendation. If you love Harley and Margot Robbie's performance of her, that by all means go, otherwise maybe wait for something better. Please don't bring kids to this, some pretty extreme violence, gore and lots of swearing, ages 17+.