And I don`t mean a book that you`ve just outgrown but which retains a lot of sentimental value for you(in my case it is Dr Dolittle stories by Hugh Lofting and his animals that could talk)no, I mean a book that you reject as downright rubbish. For me it is "In Desert and Wilderness" by Henryk
Sienkiewicz. I first read the novel when I was 10 and I loved it. Alas, when I grew up I just couldn`t stand any more of its 19th century moralizing tone that I hadn`t realized at 10 when reading it, but against which I strongly rebelled in my adolescence.
The cut the long story short, a boy of 15 remains a perfect gentleman in utterly dire circumstnaces that he finds himself in, togeher with a young girl in his custody. On top of all his superman abilities in the face of extreme adversity, after eventually having been happily rescued by their fathers (though the boy doesn`t really need any rescuing at all) he asks her hand in marriage ONLY after they are of age years later.
On the other hand, though, there are books for children that I only begun to appreciate in my late twenties, and one such book is "Alice`s Adventures in Wonderland", and even more so its sequel, "Through the Looking Glass".

I'm not sure whether to label it as 'rubbish', but I read Carrie by Stephen King over 10 times as a kid. But now its not really the sort of thing I am interested in, therefore it has been thrown into the junk pile for the past few years.

Among many children's classics I read and lived through was Jim Hawkins adventures in Treasure Island. Nothing on earth would induce me to pick it up again now as an adult. The whole idea of pirates as jolly swashbucklers is so sadly far from my adult credibility. And I know all I want to know about Long John Silver, "Arh, Jim lad". But I still recommend it to the kids before they are spoilt by the Pirates of the Carribean. The same goes for the Three Musketeers. Very silly when I think about them now, but at the time so romantic.