Carbon is a material like any other, it has its strengths and weaknesses. The quality of the product comes down to the skill of the designer and the manufacturer. This is evidenced by the fact that there are mountain bikes with full carbon frames which are not falling apart beneath their riders.

I often commute on my road bike with a carbon fork (Cannondale CAAD9 Optimo1) That model has an agressive racing geometry frame + carbon fork combo which has won the Giro de Italia and several tour stages. Although I don't actually race I love the ride, I love the fact that I can pump my tires up to 140psi and if there were brail on the road I could read it with my ass. I love the fact that it has a carbon fork and a carbon bar (FSA K-wing) which means my hands and wrists feel fine after a double century. I don't worry about some of the rough country roads I ride because I'm on quality components.