I just read a negative review for my first book. And actually I appreciate it. I don't know every person who wrote positive ones and I don't know the person who wrote the negative one. But all the reviews, positive and negative, urge me to write the best book I possible can at the time of the writing. I will only become better with each book. And with each book, I do think about how I could have made the last one stronger, longer, tighter, but my goal is always to write an enjoyable story.