The post were this phrase comes from is a very good one, but I'll alter this part to "Club players recognize their tennis
ideals in Roger's". I see what you mean but the difference in level is so abysmal that those top guys (and here I mean really elite) routinely execute shots that even good club players hardly try.
I really disagree that it was a factor. One evidence to the contrary is the running passing shot he made at 40 all in the very last game. He successfully chased down most of the drop shots. Of course that he was feeling some effects of the previous match, and you could actually see that his game plan was to pull the trigger even earlier than usual. However, he was
connecting those shots, so, all in all, that was not a B- Wawrinka. His quality of play on break points (either in favor or against him) was completely A++.
About the semifinal match, Nadal is on the very unfair position of a football player that will play a penalty shot. If he scores, not a big deal, it was his "obligation". If he misses... on the other hand it is the opposite for the goalkeeper: if its a goal, ok, not your fault. If you make a save, you are a hero, which is basically Federer's position.
I agree with El Dude's 70/30. For Nadal standard's, he is in big trouble!