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Peter David is possibly a hack and definitely used to writing comics. A key problem with his writing is a criticism I got in middle school: He needs to "show, not just tell," and rarely manages that, which makes sense for a comic writer. When you're writing a comic, the artists do a huge portion of the "showing" that you'd have to do yourself in a novel (maybe you still wrote it, but the reader is seeing mostly images rather than reading "and then Batman runs up to Superman and he gives him a hug and the tree looks less evil because Poison Ivy isn't controlling it anymore").
The following rant about how he might be a hack probably isn't as clear as it could be. Basically, this feels like it was written by a high schooler rather than an award-winning writer, and is chock-full of small but grating contradictions of Halo canon. Most shouldn't matter, but many, if you notice, tend to break your immersion and smack of an author that's not even trying. I'll try to find a good example.
It's clear that he has a pretty minimal understanding of how things work in the Halo universe. I feel like a neckbeard pointing out flaws that are often small and unimportant, but they're often the kind that are really distracting if you notice them at all. Some things could easily be picked up by reading any other Halo book, some can be gleaned by playing the games enough, and some are even nerdier. But for most of these details, if you're aware of them, then you're aware of big, clumsy mistakes that make it seem like Peter David had no respect for the source material and no interest in getting things right. I doubt he edited his own work at all, or looked at edits that came back from the publisher or 343's story/continuity/correctness team. "You don't need my consent to fix spelling errors, and you're obviously right if I got something wrong about the universe like the caliber of ammo used in a particular gun or whatever."
But bigger issues than ammo calibers can be inappropriate for editors to fix, and a lot weren't.