Now, I find
Heroes in Crisis interesting, but that's largely
because of its flaws. There are good ideas in there, and it tries to work with stuff that's important, but then it fell apart. I think it'd make a great workshop or interview question for a comics editor, especially if presented in outline format: point out one or more problems with the narrative, and give proposals on how they could or should be handled better.
Now, there are lots of classic works that were badly received at publication, but that turned out to be long-lasting gems. But I really doubt
Heroes in Crisis will turn out to be something like that. Its flaws aren't matter of aesthetics or being different. Some might be a matter of taste, but the more fundamental ones are not. Some are also falling on the tail end of narrative devices that are facing heavy criticism and are on the way of being phased out.
I wrote a
long post about the (lack of) theme earlier, and that's I think still valid even with the last issue.
The way it was marketed as a murder mystery, but it was most assuredly not written as one. Now, that's partly a marketing thing, but it's something that editors need to think about. And having any form of mystery plot (which it had; it just didn't use it to drive the narrative) when you introduce both VR and time travel is simply a bad idea. Both VR and time travel breaks narration and causality and the normal writer–reader contract to such a degree that they must be at the centre of the narrative if they are to function, not add-ons at the conclusion. That's something that science fiction writers grok, so I don't understand why DC missed that here—remember that early science fiction fans had a huge impact on DC for a long time. I really don't think it's because writing and editing comics is for those writers and editors who couldn't cut it in the science fiction field.
The fridging of Poison Ivy, and the way she became "better" by being killed and then saved by a man. That's not only totally tone deaf, it also goes against the very theme and development of the character during the last 30 or so years. Now, to me it's rather clear that King has no idea on how to write women, but this one picked up some of the most pandering and damaging themes of patriarchy around.
Then there are the sheer number of stuff that's hinted at but simply dropped. Not acknowledged, but simply dropped. The reaction from the larger superhero community to what is effectively a mass shooting. The way the narrative humanises the perpetrator but anonymises the victims. The ethics of publishing and the act of making all those private medical recordings public. What Wally attempted to do, or did, during those five days.
I think it's telling that for a veteran reader many of those issues were apparent rather early on, but it wasn't until you reached the end that novice readers could get that there was something hollow here.