I've read poor reviews on the strategy guide though, stating that it's even a bit confusing in the way it's written, and that you have to flip from one section of the book to another pretty often. The lists in there are said to be incomplete, with the weapons list excluding several items, the screenshots accompanying the guide are said to be irrelevant or unhelpful most of the time, the sidequests are all over the place instead of being clearly sorted, etc. The maps are also said to be not really clear-cut, which is a shame since that's what I usually get a guide for in the first place. It also didn't include the codes for many of the lockers, although that can be understood since they are supposed to be pre-order bonuses, and tbh I couldn't care less about the bonus weapons anyway.
Are any other companies making guides for Downpour though? I don't really care about the actual walkthrough of the main plot, I just want a good map, a list of all the items (like key items, artifacts, weapons, etc.), a list of the creatures, a clear list of the sidequests, list of the endings, maybe a plot analysis or something.
Maybe that's just wishful thinking on my part though
As of right now though it seems that only the one guide exists so you might be out of luck there. If you want to take your discussion to the spoiler thread linked above to get an idea of how people here may like the guide, please do so.