The only game related books I read were the official mass effect novels.
The first three books by Drew Karpyshin were great, I can't recommend them enough. However the fourth book "Deception" by Dietz, is awful, avoid it like the plague. The writer was simply lazy and failed to get up to speed on even basic mass effect lore, and also ruined or wasted the characters built up by Karpyshin over the course of 3 books.
I also read the first half of the Mass Effect Andromeda NExus Uprising novel. Why just half? Because I couldn't go on, it was so atrocious. This is an entirely other level of bad, compared to deception. This is not bad due to lack of research, it's bad because it was co written by untalented hacks. I've never seen this dreary and awful writing, infused with such social propaganda. Trying to raise feelings above science, which is ironic for a science fiction novel.