I just finished watching it, I had been putting it off because of what everyone has been saying. And OMG, this movie is definitely amongst the worst the genre has ever produced. I mean Batman & Robin bad. SPOILERS AHEAD
The ENTIRE plot was based on a McGuffin! They weren't even trying to hide it! And then they make the rules up as they go. When did the rule appear where he grants wishes and gets something in return? The original item was a stone, and it certainly didn't get anything in return for giving wishes. I mean, did Barbara's "joy" and "warmth" get absorbed by the stupid stone? Wishes. Yeah right.
What about the bracelet? There must be a ton of deleted scenes, because nothing outside of Lord having some phantom knowledge about the stone, is justification for him having an Indiana Jones room in his building that was borderline abandoned just hours before.
Virtually every scene had some problem with it, whether it's the writing, or Pablo Pascal's horrendous overacting, or the flimsy way they handled Steve's return. Ha ha, so funny, he takes over an 80s guy's life. Whoo hah. Funny how the spend so much time at the beginning giving away that it's the 80s, and yet, Gal Gadot consistently dresses like she's in the 2000s. I hate movies that hit you over the head with the "era" and then don't stick with their own rules.
Gal does what she can, and she is definitely a better actress now than she used to be, but my goodness, Patty Jenkins should be ashamed of herself. As should Warner Bros.
Silver lining -- compared to this, Zach Snyder's Justice League might very well be a masterpiece (I don't think it will be, but still).