I disagree with your take, aside from Joker/Harley/Amanda Waller. Agree on those three takes. Harley killed it and was having fun filming this. Jared Leto great actor. Amanda Waller great character and great acting.
I couldn't stand will smith in this, and thought the whole movie was rushed and music-video styled...intro, intro, intro, scene, scene, scene, quip, quip, quip, bam, bam, bam approach. Do I give a crap about any character? Nope. Why? Too many of them.
And for the love of all that is holy...Killer Croc?? Captain Boomerang??!! Spare me. Geez, they could have taken some creative license with these characters and changed them to something not laughable.
They race by any sort of exposition on the characters we are supposed to care about, then suddenly in Act 3, the gang refers to themselves as a "family". Wait, wut? When did that happen? Lol
Sure, it may have been better than most DC flicks, (including bat vs supe) but that is setting the bar low.
10 pounds of sausage in a 5 pound bag.
Now Deadpool, there was an entertaining clever flick!