Whether a book is good, as in whether it has literary merit is not just a matter of opinion. This book is good literature based on some criteria that make it a classic. Whether a book is good for your child depends on their maturity. If they can't tell the difference between a role model and "selfish madman," to put it in the words of our intelligent 17 year old reviewer, Victor, then they're not ready for it. It is a wonderful book for a person mature enough to see Holden for what he is, as painted beautitfully by a wonderful writer who has left it up to us to identify with, be entertained by,learn from, judge and come away better for it. Now Victor, you ask whether it is wrong to be a "selfish madman." You can take my word for it that it is, or you can let life teach you. I think you already know. I enjoyed your review.
PS. Not just age level, but emotional maturity level should be above 15. Anyone with arrested development could take away a pretty twisted reading of it.