Very boring - little true investigative journalism, poorly edited together with few formal interviews. In fact the only time that things do get interesting is when Palin herself is on-screen, mainly shown during previous interviews and through footage of some of her rallies.
Nick Bloomfield fails on all levels to raise this to proper documentary standards. In fact, I found it embarrassing as he is seen continually wondering around, mic in hand, headphones on, stumbling in to different situations/ people, seemingly without plan or reason. His one interaction with Palin, when he rudely stands during a presentation to ask an unintelligent question before being hassled from then room, is truly cringe worthy.
If you want to find out more about Sarah Palin, you'd do better to You Tube her instead or, better read, read one of the many books written about her (including her own autobiography). There's nothing new here.