I thought that Nadal played the FH down the line nicely against both Djokovic and Federer.
Yet, I still believe that the Nadal-Djokovic was unnecessarily taken to a fifth set. Djokovic should've won the 4th set tiebreaker 7-3. Now, the final appears very close, whereas I felt Djokovic was pretty much in control (i.e. 75% of the match).
In the end it wasn't about tactics, but about survival of the fittest or something.
Having said that, I think Djokovic in his current form is simply a bad matchup for Nadal. There is not much he can do to overcome Djokovic.
The current status in the top4 is something like:
Djokovic > Nadal, Murray
Djokovic >= Federer
Nadal > Federer, Murray
Federer > Murray