Still a great level of play (87% of service games won like in 2008, 37% of return games won on hardcourts -35% on all surfaces-, which is far better than in any other year than 2011 for him, and would have been considered as huge in any era if there had not been last year)
but fragile in pressure moments : big matches and French Open and clay period (Roma final) where he had the highest stakes.
Also a very solid game but less brilliant than last year, lacked the flashes which are very important for a player's general appreciation and for fans' pleasure. A little bit boring to say the truth.
Still clearly looks as the dominant player since last year and for next years, which is something big. Fans have been too much used to winning 3 slams a year in last 10 years. That said, yes I think Djokovic will do better next year and I'd rather bet on him winning 2 slams than 1 like this year.
Overall I still see him as the dominant Lendl of these years although he's much more lovable than Lendl