The Cove: 8 out of 10.
Now don't get me wrong, The Cove is a great documentary about some bad shit going down in Taijii, Japan. I really liked it. But The Cove won the Oscar for Best Documentary, and it's not that good.
Off the top of my head, I can think of a couple of documentaries I watched last year that were superior. Anvil, for example. And Dear Zachary: A Letter to a Son About His Father.
But you should see it, cuz it's good. Unless you really, really like dolphins, in which case this is a bit of a snuff film.