Many people who read the book claim it to be an insightful piece of work that most likely changed their lives/outlook.
However, the argument presented by both sides in the book are no more deep or sophisticated than those you'd find in the YouTube
comment section (although the book certainly is more verbose- don't read it if you have a short attention span!).
The only arguments the religious side presents are Aquinas's. This is all well and good, if the writer was a 16 year old who'd happened to read an R.E. textbook. It's slightly less impressive coming from a published author. Additionally, Beneditx provides no rebukes to Palinor's counter-arguments other than the odd, easily disproved addendum to the main argument. In other words, the author has set up an argument between a person used to arguing religion (Palinor states himself that he often argues religion with his friends back home) and a person who has only ever read books on the subject, with no opposition. It's like an argument between a physics professor and a 5 year old, and the professor's arguing that the sky's red- no matter how outlandish the professor's argument, he easily outmatches the child, through out-of-context snippets of fact and rhetoric. It misrepresents one side.
Then, on the atheist side, we have Palinor. He provides convincing arguments- he'd have thousands of thumbs-up if he ever followed his true YT calling- and yet as a character, he's quite possibly the most boring, tedious man I've ever had the displeasure of reading about. He doesn't change through the entire story! It makes it extremely difficult to care about him, and by the time he was killed, I actually didn't care enough about him to feel sad OR happy. He was also quite the unlikable character- he goes a couple weeks without his wife before deciding hey, he wants sex, dammit. SOME loyalty to his spouse would have been, well, EXPECTED, really.
Overall, you could view the book as a story or a philosophical paper. If you view it as a story, Palinor has no redeeming qualities, and if you view it as a paper, Beneditx is without virtue. Either way, the whole thing is hideously/hilariously imbalanced.
Long story short, it's only seen as good by people who have no prior knowledge of Christian (or just religious) philosophy. Or of literature.
If you're doing this for Lit., I'm so sorry.