I like having the nutritional content posted on restaurant menu's. I know it is only an estimate, (but I also think that is true of most nutrition labels, nothing is exact).
I know when I go to restaurants where I have looked up the nutritional value I make better food choices, as opposed to when I go to restaurants where I don't know the value - I tend to become lax about my choices.
It is a tool just like anything else. The better informed I am, the better choices I can make. I think this is a good thing.