Copied from my Amazon review of the book.
Like most self published stuff, it needs an editor to clean up the writing errors, but I do not penalize stuff I got for free for minor writing errors (grammar, spelling, punctuation, sentence formation, etc.) unless they are bad enough to be a serious distraction to the work. In this case, it was only a minor annoyance to me.
As I am writing this review I am still trying to figure out the book. It reminds me a lot of Patriots. Change the premise from financial meltdown to asteroid, strip out the nutty religion and militia stuff, tone down the gun stuff and there is not much difference. Kind of a survivalist instruction manual with advertisements for various products put in along the way. This one does a better jobs of inserting the ads, not so obvious, and less often. Neither are especially well written, but are readable.
At various points in reading the thing I wondered if this was supposed to be a parody of survivalist literature. I am reminded of films that are fun because they are so bad like "Mars Attacks" and "Attack of the Killer Tomatoes". There is very little in this book that is plausible beyond an asteroid coming toward Earth. And yet, on some level it must have worked for me because I ended up reading the whole thing.