Federer - too CLEAN for Nadal?

I was checking out Eurosports recap of the FO final, and a comment made by a user at the bottom brought up a good point that I've said from time to time, but with a different basis.

Basically he said Federer is a 'ponce' and doesn't chase down balls ever since the time where he was donning the Nike jacket at wimbledon.

I noticed that Federer chased down far fewer balls around 2006, which I thought was due to trying to conserve his body and energy. But i think this guy is right.. federer tries to win with as little work as possible, and doesn't want to get dirty, which means that he gets eventually outrun by another player.
Do you agree? What do you think