Rosstour
Talk Tennis Guru
I would say this for 2014-15 "old" Federer, but not for the "new" Federer of early 2017 who was clearly better.
Fed was actually very good in 2014, 2015, and first-half 2016 before the injury. If he hadn't gone down in the US'14 SFs, he might have 19 Slams now. As it is, he reached 2 SFs and 1 F in 2014, then 1 QF and two Fs in 2015...followed by 2 SFs in 2 attempts in 2016. That is very consistent.
His only really 'bad/old' year was 2013, even in 2011 he reached 1 QF/2 SF/1 F.
I think what's apparent is that he made some big adjustments on the fly after 2013, and his results over the next 3 years were better...and then being able to actually rest for 6 months seems to have allowed those changes to really take their full effect.