Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Least favorite

I started reading the Jack Reacher novels three months ago, and this is the sixth one I've read. The novels make for compulsive, page-turning reading. But the author also has a very good eye, a deft turn of phrase, and an interest in recounting facts which have left me with the impression that I'm reading something better than trash.Most reviewers seem to prefer the early novels in the series, but this is my least favorite so far. The story started well, but quickly became implausible. And, in contrast to the later novels, Mr Childs doesn't seem to bother with factual research, and just makes things up, regardless of whether they're right: this undermined the novel a bit for me.It's still a pretty good read, and I'm enjoying it, but I enjoyed all of the others a lot more.