It seams to be a love it or hate it proposition.
One gotcha if you do like it is it automaticly grabs the square out of the center of the photo, so on a close croped photo, your going to lose heads etc. If you want to choose where it grabs the square from, then you have to go into bulk features.
The reason I got so lit up when it was happening to me, was it was taking the head off of every single batter I had shot, and no one is going to click on a headless thumbnail.
My biggest problem is that a new feature should not be made the default, if it is something that is going to change the look and feel of what you have set up, you should have to choose to do so, not choose not to do so. just my 2 cents.