I continued going after the first book of Defiance and the series keeps getting better. The writing has improved a bit but the real reason I keep going is that the further Zac progresses and learns about his unique heritage the deeper the story gets. The initial story of a thirty year old marketing exec being inducted into a System run universe and fighting alone to overcome an alien demon incursion isn't remarkable for the genre but we like rooting for the mortal underdog as he blunders his way along. Except it quickly becomes clear that Zac isn't exactly the underdog when it comes to his amazing luck and hints that his mother wasn't from Earth. His background is truly unique and it gradually appears that his cultivation and advancement will effect the entire multi-verse. Nope, no spoilers here, if you want an idea of what's going on you have to read book two.