Djokovic 2015 is a more complete/sensible tennis player, but Djokovic 2011 was an absolute monster, and if the two were to face off I have little doubt that the 2011 version would treat the 2015 version something like Stan did at Roland Garros. The ATP in 2015 might be about as bad as I've seen it since the early part of the last decade. It's probably worse. The old guys are starting to fade, and the young guys are not stepping up. It's embarrassing, and Djokovic has been strong enough to capitalize on that. I'll take him trouncing Nadal 6 times in a row on 3 different surfaces in the prime of his life over what he's been doing this year any day.