I checked this out of curiosity because the idea sounded interesting, but I regret it. It's money and time I'm not getting back. I don't follow much of DC these days, so while I know Geoff Johns is a big wig over there I'm not familiar with his other works. And from reading this alone, the guy is a hack. I don't say this sort of thing easily. He is that bad. The writing is clumsy, self-contradicting, self-aggrandizing, and it's not doing anything notable, interesting, or even attempting at being innovative in any sort of way in 2020.
This story even manages to do a disservice to the Killing Joke by trying to retcon it at the end. Instead, the only thing he did was make me go reread my copy of it and -- guess what -- it holds up, it holds up so damn hard. Every single page of it is something unique, creative, extremely detailed, and making perfect logical sense in the boundaries of the story it's telling. Any page could be pulled randomly and there would be something amazing to talk about it.
On the other hand, you have this Three Jokers where most pages are baffling empty, with nothing of note happening. The story is trying to tell makes little sense at the end. Its internal logic is also super wonky, because you have this Red Hood guy murdering a bunch of Joker converts as if they weren't legit people and, more importantly, victims, which makes no sense in any Batman story -- he would never let that happen under his watch. And looking back at the panel structure of Killing Joke, it's clearly Geoff Johns instructed the artist to try to "homage" them without understanding that in doing so he's just limiting the story even harder, turning what was already badly told even more evident and stifled.
Like, even the after effects. The Killing Joke did not set out to do this, yet it changed the DC Universe drastically. While I read an interview that Moore regretted writing this story because of the change of tone it led to in the industry and "destroying" Barbara as a character, it ultimately led into other great things. I stopped following DC maybe back in 2010 or earlier, but I remember very well how Barbara, turning into Oracle, a badass hacker/leader/mentor to other super heroes was the source of inspiration to a lot of disabled people. This status quo lasted for nearly two decades. Three Jokers, though? What good can even come out of it? My only hope is that other authors look at this and decide never to write something so meandering and badly intended.