One of the most insane crossovers I've read/listened to.
When I first started listening to the Infinite Timeline books, I knew what I was going into (especially since I think Infinite 2 had just come out when I started). It was really fun to see the characters come together to save the world over the course of these mostly disconnected novels.
For the most part, most of the novels I could see existing together like Mindbullet, The Dark, and Exo Hunter. I was very impressed seeing the Red Dwarf-esque Infinite novels tie in with the rest of them. That was where some more of the insane creativity comes into play.
I had some issues with some self-insertion. It was awkward with Stephen King did it in the Dark Tower series and it's awkward here, but I think given the multiverses being played with in both series it works, especially since both authors tend towards self-deprecating humor (especially Jeremy Robinson), but it's still a bit awkward. I don't know. I didn't let it bother me and it didn't become too dues ex to ruin the overall experience.
While my time with this series was over the course of a year or so (spreading it out with other audiobooks), and not over a couple of years like the author and some of his readers, I still felt like this had the same impact for this series as Infinity War/Endgame did for the MCU and I think that's what Robinson was going for. While it's not Iron Man, Spider-Man, and The Hulk coming together, these are characters that you are excited to see work together.
My only issue, then, would be that in their own novels, they tended to sound the same and I didn't really see that much difference until they came together. I wasn't constantly confusing characters (though sometimes, I did struggle to remember names just because there were so many of them and most of the characters other than Dark Horse, Maia, and Brie were not narrators and I didn't remember the narrator characters from the previous books' names as much as the ones who weren't. For instance, I kept forgetting that Mindbullet's real name was Jonas and had to stop and think about who Jonas was.)
I also had a small gripe that I felt like the epilogue was a bit of a letdown. I didn't want a long and drawn out epilogue, but considering the massive story that was told in this series, it didn't seem like much at the end there.
The other small gripe is that I felt a bit of FOMO (fear of missing out) because I was under the impression that all I needed to know from this series was from the other books in the series, but there are a ton of references to Robinson's other work in this, Infinite 2, and The Order (since one of the characters from Nemesis is in The Order.) The big showdown has a ton of creatures from the Nemesis books. Granted, I didn't feel that much confusion having not read anything else by Robinson, nor did I feel like there were really any spoilers for the non-Infinite Timeline novels, but I would've liked to have had that context. Might have made Cowboy's appearance in this and The Order more meaningful.
And last, but not least, I'd like to talk about RC Bray since I did listen to the audiobooks. Huge fan. I think he did a fantastic job. I could tell Robinson was having fun making him say certain things.
Overall, great ending to an awesome series.