But it seems to me that your analysis is always "when djokovic loses to Nadal, he was average".
Nadal's clay peak was 2005 european clay season - 2008 RG. 2010-2014, he was already heavily declined.
On grass, his peak was 2007-2008. Even though Nadal lost to Federer in 2006, that version of his would beat his 2010-2011 versions IMO.
HCs - I give Nadal 2010 USO-2013 USO.
I gave Nadal 4 peak years on clay. 2 years on grass, in reality 3, I think 2006 Nadal on grass was peak because of his incredible movement on it. HC, 3 years.
What are Djokovic peak years in your opinion?
Peak to me refers to the absolute pinnacle of play so saying someone was at his peak for 3+ straight years is not usually viable since there will be valleys in that time. Nadal on clay from 05-08 is the exception of course, probably the most dominant Tennis from anyone ever.
I listed out my peak Djokovic times earlier:
1)DC 2010 Final - USO 2011 (ended when his cincy injury to Murray was exacerbated in the DC match with Del Po leading to a fatigued and injured post-USO 2011)
2)AO 2012 (The finally hurrah after he was recovered physically from the post-USO 2011 indoor season. After this tournament, Djoker had a very visible decline throughout most of 2012)
3)Beijing 2012-IW 2013 (Prompted by the loss of his #1 ranking and losing the USO final in his poorest USO showing since before 07, Djoker refound his peak for a few months to close 2012 and begin 2013. Ended following the loss to Del Po at IW 2013 followed up by a bunch of random loses with poor form play to Dimitrov, Haas, Berdych etc..)
4) FO 2013 (Despite being sub-peak for most of the 2013 Clay Season, Djoker definitely brought a peak level performance for the FO. The emotion of that fight with Nadal and the ultimate loss pretty much sent Djokovic to average levels again for the next few months)
5) Beijing 2013-Monte Carlo 2013 (Similar to the end of 2012, prompted by the loss of his #1 ranking and not a very great USO performance, Djoker refound his peak for a few months. Ended with the wrist injury at MC. Unfortunate he could not maintain this peak for RG 2014. He has only been in his peak for 2 RGs - 2011 losing to Fed and the 2013 epic).