I read the whole bible earlier this year so was quite well primed when the JW's came to call. The put an enormous store in the book and it's 'consistency' and 'truth', so I thought it best not to generalise but to quote the book directly back at them to hopefully reveal it's weaknesses. Firstly I told them how I found the morality of the Old Testament really barbaric and repugnant. They countered this by saying that the New Testament superseded the old and ushered in a new moral order. I expressed surprise that they thought God's laws weren't eternal and that he could change them as he went along. They said that Jesus changed everything. So I said, 'What about Matthew Chapter 5, verse 17'? and showed it to them:

"Think not that I am come to destroy the law, or the prophets: I am not come to destroy, but to fulfil. For verily I say unto you, Till heaven and earth pass, one jot or one tittle shall in no wise pass from the law, till all be fulfilled. Whosoever therefore shall break one of these least commandments, and shall teach men so, he shall be called the least in the kingdom of heaven: but whosoever shall do and teach them, the same shall be called great in the kingdom of heaven. For I say unto you, That except your righteousness shall exceed the righteousness of the scribes and Pharisees, ye shall in no case enter into the kingdom of heaven."

Thus, Jesus clearly does not repudiate the harsh laws of the Torah (Leviticus, Deuteronomy etc), but supports them fully in every 'jot and tittle'. My JW visitors admitted they couldn't provide me with a satisfactory answer and said they'd consult their authorities and then get back to me. They haven't visited me since! - I think I may have been put on their black list!