With their lack of objectivity vis-à-vis this book, many of the previous reviewers make me wonder if they've read it at all. In possible contrast to some of them, I actually did read the book this weekend at a friend's house.
Readers who would praise self-improvement books of other stripes have no reason to demur at this "light read" by the president of The Church of Jesus Christ of Latter-day Saints. Judge the values Hinckley espouses for yourself: love, honesty, morality, civility, learning, forgiveness and mercy, thrift and industry, order, gratitude, optimism, faith. Not only are they not exclusive to Mormons or Christians, but I would posit that even most irreligious people would find little fault with any of those attributes, save perhaps faith. Hinckley himself repeats two or three times that he is "a churchman", so finding faith on the list is no surprise.
Hinckley had an extensive public relations background within The Church of Jesus Christ of Latter-day Saints before and after accepting leadership responsibilities so no one should doubt his capacity to author this book. That being said, it is also patently clear that Hinckley chose to write "Standing for Something" at about a Reader's Digest level--which in itself is no bad thing. Most casual readers aren't looking for Augustine or Aquinas. If they were, then Chopra and Covey wouldn't sell.
It is naïve and highly myopic to suggest that this is one of the best books ever written, but it is equally dishonest to pan it as sheer pablum. The truth is that the book is an accessible and straightforward review of principles presented in a manner that is for the most part engaging, if not particularly complex. If you are looking for a more intellectual treatment of ethics or morality, then you should already be aware that you are shopping in the wrong department. If you are looking for a casual read that reinforces principles of good living, then this will meet your needs.