This book proved to be a big disappointment. The synopsis lead me to believe it would be a fast paced military sci fi. Unfortunately it was a meanderingly paced Scifi, that tried to do comedy and military.
Cross over/mashups are not a bad thing. However, I've read enough bad ones to know you have to lean into the mashups, rather than try and tip toe around them. The comedy elements of this book are so few and far between it becomes more awkward than funny. The author also pulls back too much, like he is ashamed to have his characters acting that way. One character will make fun of another, then immediately apologize and say how amazing that character is. It's inauthentic and unfunny.
Beyond that, the characters are given detailed back stories and have a fleshed out history, but because they have little consistency to their character traits (saying things and taking it back, etc) it becomes hard to form an emotional connection to them. Meaning, when they are in danger, I was uninterested.
The dialog is similarly bad. Incrediblely cheezy and cringe worthy. The story takes place with humans and aliens working together in space with AI's and ftl travel and I still refuse to believe conversations will ever be that awkward.
The author has put much more thought in the model numbers of everything in his universe than his dialog. Unfortunately, this is not a case of attention to detail, as much as it is an exercise in tediousness. I no more need to know the model number of a future rifle any more than I need to know the serial number of the servo motor in my printer. It's not pictularly useful information and it tends to clutter up a story.
The science of the sci fi is also poor. The space combat is supposed to be similar to something from a Hollywood movie and bears no resemblance to the reality of space. At one point they are within 2km of a moon and can't see it.
The book also manages to tick every box on the sheet for cliche in action/sci fi. Secret bases, wounded leader, don't know who to trust, run away from danger but accidently into more danger, endless bad guys, bad guys are useless, monologing, enemies who are just misunderstood allies, etc. And to make it worse, one can see it all coming from a mile away (which apparently is a distance which it's hard to see a moon from).
The other big problem with the book is the narrator, Andrew B. Wehrlen. He did an OK job with the book and did a good enough job at differentiating voices. The issue with Mr. Wehrlen is that he lacks comedic timing. I think the jokes could have been salvaged with a different narrator, but sadly Andrew wasn't up to the task. I would gladly listen to another of his readings, but not if it has comedic elements.
All in all, a boring book with nothing new to say. There are many, better books in this genre that are more worthwhile.