I had read Book 1 and 2 and now I'm going through Book 3 because this thread reminded me of its existence.
It's a good CYOA with some good characters and a fun adventure, and I appreciate that it keeps few stats and that they have low values, making them simple to manage. I also like the lore the author built around his story.
It obviously has some limitations due to practical reasons; Austin already mentioned its linearity (I only played one path but it's pretty clear that the story has to converge at some points), and another weak link is in my opinion how OP the protagonist and how tame some of the villains seem to become, making those who seemed difficult antagonists look like not much of a threat all of a sudden. Of course this has to happen in order to make the good guys win and keep most of them alive; I just hope that these kind of character developments are written well though.
One thing I noticed in the third book is that the author's slipped up a few times with verb tenses, using the past tense in situations that required the present tense as usual. I'm still at chapter 2 though, so I won't pass judgement until I've finished this book. I will say that I enjoyed Book 2 the most so far though.