Originally Posted by Breaker
It is actually the reason only players with elite backhands/movement can attack him consistently, your choices are either to step in and take risk by taking the ball on the rise like Davydenko/Djokovic/Nalbandian do -- or wait behind the baseline and concede court position either through attempting to run around it or hit a high backhand which pretty much puts you behind in the point once the nadal gets it back.
If he consistently hit deeper with the same trajectory the ball would kick up right into most players' sweet spots.
^^ This. His forehand is basically a kick serve.