[Fyron]

you cant decide on wether a book is good or not only after a few pages. you have to read the whole thing.

That's just not true. It is quite easy to judge a book after reading a few of its pages. Maybe not the first few (a lot of books have slow begninnings), but just pick some in the middle and read them. Then pick a few pages at a different point and read them. You can get a good sampling of what the book is like from a few pages.