I also read Lying and I thought it was really, really vapid. I would have liked Harris to go into more social techniques that allowed him to be honest without offending. Instead of that, which would have been very useful, Harris simply parroted the old "lying doesn't solve problems..." Honestly, Lying seems like something he pumped out in a short weekend because he hadn't released anything in a while. Very disappointed.
If it was worth taking seriously it also would have been much longer. Go read Sissela Bok's Lying: Moral choice in Public and Private Life then try taking Harris seriously.