the books i disliked most were books w/too much cassie. i know, there are gonna be ppl here who disagree with me. but oh well. she pissed me off, plain and simple. ALL THOUGH, i loved book #14 and #24. they were hilarious. sure it was cuz of marco, but still. awesome reads. to me the last book was the worst, i hate things that dont end. if its an ending, it should end. not introduce a new topic like there is gonna be a sequel, but then have no sequel. i dk, i kinda liked the mutation, not my fave, but not my most disliked either. cassie in australia was lame, wasn't a fan much. book 43 wasn't well written enuf i think. the idea behind it was good, but the author just didn't know know to expand on it and explain it well.