That's the title of my newest post. Basically, since there's so much variation in how Protection Warriors can spec depending on the encounter to gain an advantage, it makes it impossible to say... "This is the perfect tanking spec"
Is your class like that?
If so, I'd give this type of post a try. Very easy to make and while the results aren't in yet. I'm thinking this one is going to be a real hit. (look for the real response come Monday, weekends are notoriously terrible for WoW traffic)