Current book is reminding me of another. Maybe I'm just getting picky these days but this particular thing seems really lazy to me.
So, the main character is a Larry Sue. Not perfect, but flawed just the right amount and in the right "accessible, identifiable" ways (you can hear the agent pitching him). That's not the problem. The problem is that every other character is only written for what insights they can offer about him. When one minor character was introduced, he was described in a couple of paragraphs and then the authors (two of them) spent two pages outlining what this guy thought of Larry Sue (almost a full psych profile, that level of detail). Sorry, but I don't for a minute buy that the minor character, described as self-involved mind you, spent that much time pondering the wonder that is Larry Sue and his stoic-yet-personable attitude towards life. Another major character got a bit more personality but again most of his point-of-view commentary is about Larry. The three female characters have zero depth so far, existing only to check necessary diversity boxes (one is black!). I can only assume we'll find out what they think about Larry in due course.
Also Larry Sue, who was tragically widowed in the first 50 pages, is now (after an appropriate length of time) involved with his previously platonic, though raging hot, coworker. And he stole a promotion from her, but she was okay with it (I guess since any fallout is never mentioned) because he was more qualified. He is, after all, Larry Sue.