Synergizer wrote...
I'm very wary of generic writers that cash in on pick-up popular franchises.
Partly because their books are often written without interest in the subject matter background research, and are usually just pre-conceived stories with names and places changed to protect the innocent adapted to take place in the chosen franchise's Universe with some familiar characters. They just lack a feel of authenticity.

What was possibly worse in Deception's case wasn't just that it felt inauthentic and weirdly unrelated to Mass Effect (to be fair to Dietz, he was writing in somebody else's universe with probably very little preparation time), but that nobody from Bioware seemed to notice or care about the errors. If anything the responsibility falls on them to proofread the novel properly before release.
Casey tweeted that he was reading through a draft of Deception to give his approval a while before it was on shelves, but apparently he didn't notice the yawning mistakes, or the sheer awkwardness of the writing (a character switches names twice over ten pages or so), or the discrepencies between the novel and the other books in the series. He was definitely busy at the time finishing ME3, but why not delegate proofreading to someone at the company who actually had the time to check it properly?
I know it's a tie-in novel to a videogame series, but for a developer that apparently elevates narative above other aspects of design, not bothering to release the novel at a high standard was really very disappointing. It's kinda hard to have faith that Bioware actually cares about the universe it's created when senior people at the company are willing to approve and endorse storytelling in that universe which gets so much wrong, and so clumsily. Deception felt like a obligatory pre-launch novel that some IP development executive wanted to fill a schedule hole somewhere, rather than a considered and, I guess, necessary addition to the ME series.
It all makes me pretty cynical about the studio's attitude to its own creation, basically.