Flabbergasted

I am amazed at all the glowing reviews posted for this product I just received. But what books these people have put this desk and be satisfied? Personally I bought this desk to take a small book of about 500 pages size (the thickness of the book corresponds to the width of the horizontal support board): Can not keep it open !!! What is this hinge that hardly put any pressure ??
At the limit to deposit a tablet, which will hold its own without needing the hinge, okay but certainly not a book.