The villains were both fun to watch, and to empathize with. I really dug Max Lord's desperate suaveness. Though him flying to Egypt and back was an odd whiplash.
Also, one small line would've fixed a bit where I had trouble suspending disbelief. When they get the jet, just have Diana say that this is cutting edge Wayne Tech, able to fly around the world twice on one tank of fuel. (Or insert appropriate DC-Universe arms manufacturer; I know Bruce would be a kid in 1984, but his family's company might have developed nifty fuel tech.)
The 'moral lesson' climax worked for me, and I teared up at the emotional beat. But the 'physical conflict' element of the climax fell flat, in my opinion. Fighting Barbara just felt like any other CG vs CG action scene, with no real payoff to their relationship. And I wish they'd spent more of the denouement showing a bit of the aftermath for the various characters.
Honestly, I wonder if the movie might have benefited from somehow getting Barbara and Diana to work together in one action scene. I'm not sure where you would have put that, though.