I agree. I recently downloaded a sample that contained nothing but the title, publisher and author info pages. How is that helpful to me in deciding if I'm interested in the content? Samples should contain at least a portion of the first chapter if not the whole thing.
It is the same on Google Play and Barnes and Noble nook. I have also found this is the case for a few other books as well. There needs to be some more diligence in making a good sample other than just giving us the first 40 or 50 or so pages in the book.