Overall? Entertaining, but flawed. As I always pretentiously say when I review these novels, I'm assessing it under the lens of what it is - a video game spin-off novel (so I cut it some slack). What I appreciated about the Forerunner saga, in contrast, was how it was less about the action and more about the prose. This novel was the complete opposite, as it was definitely about the action and the prose was just there to tell the story. Now, it wasn't a bad novel at all. In fact, in a fight it would kick the ass of all three of Karen Traviss' abyssal novels by itself.
It was funny. Buck is a hilarious narrator and he thought and talked like a real person; he was rough around the edges, he acted out of emotions as well as could keep it cool, and he was likable. The other characters were flat as hell. I couldn't tell any of his buddies from one another - we are never shown anything about their personalities other than what Buck deliberately tells us. Even Veronica, though you could tell why Buck was smitten (because she was kinda bad ass), had no personality either.
But, the novel was very entertaining. The fight scenes were fun, the action moved at a quick pace, and I flew through this novel. I read it in like two hours.
Holy shit, there was a romance! Not a particularly sexy one by any means, but at least it was there. Why does this matter? Because it's human. People fall in love, they have attractions, they sleep with other people, they get distracted by DAT ASS, and, while there are exceptions, most people like a little romance in a story. In fact, it's unrealistic when a character tells a story that spans decades and they never once had a sexual thought. The previous Halo novels featuring humans (aside from Contact Harvest) have never had a main character in a relationship, which is just stupid. Also, one of the other soldier's "romantic proclivities" was also mentioned at one point, which was something that the other novel glossed over for some reason (because soldiers don't have random sex, apparently. *rolls eyes*)
The biggest flaw was that this novel was too fast. Like whirlwind. Everything is rushed. This novel had so much going on that it easily could have been 400 pages, not 200, and it still would have needed more depth. Hell, this would have been a good trilogy. Beef up the romance angle to make it more tragic (their struggle to have a relationship given their devotion to their jobs) and beef up the other characters so we actually care about them (and the twist at the end would be more emotionally involved). To be honest, I didn't give two shits what happened to anyone in this novel. Even the battle scenes were rushed. Oh, there's a tank in our way. Well, we beat it. Moving on. WTF.
The format. At first the jumping around really annoyed me and felt sloppy, but by the middle it kinda made sense and I forgave it. It could have been done better - in fact, I have no idea WHY it was written this way as it didn't make the twist any different had the novel been just a typical A-Z plot. I wasn't sure whether it was a stream-of-consciousness where the narrator was thinking about his life and various memories spawned past ones or whether it was an oral history. Either way, it wasn't entirely successful, but the fact that it was done in a different style than the rest of this ever-growing series was kinda remarkable.
Lastly, this is a personal peeve of mine - I'm not fond of first-person narration. But, that's just me.
Oh, and where the hell were all the aliens!? But they appear to be on the cover art of the next one, so here's hoping we get some Elites with dialogue.
Overall, a fun time!