Federer, in his own words, never played better tennis then in 2015 and he said that several times. Nadal was off but still not that much that he should not be counted in, he was in top 5 wasn't he? I didn't "inflate" anything. I provided you with the facts and the fact is that Novak in 2015 had 21 wins against slam winners and much better players than those Federer faced in 2006 winning merely 4 times.
Even if it was fair to scale down his wins to Murray and Wawrinka like you suggest that is still better achievement than Federer's equivalent from 2006.
Ahahahaha, oh god.
So Federer, who won 3 majors a year 3 different times, and was pretty much guaranteed to play every final ever, never played better than he did in 2015? Please show me where he said that. Show me one of those "several times" where he claimed 2015 was the best he's ever played.
Nadal was off but "still not that much"? Are you kidding me?
His best result at a major in 2015 was a quarter final. A guy who's won 14 slams total. In 2008, Nadal played 2 slam finals and won them both, reached every slam semi, and won 3 Masters. In 2009, Nadal won a slam and 3 Masters. In 2010 Nadal played 3 GS finals. won all 3 and won 3 Masters.. In 2011, he played 3 GS finals and 5 Masters finals. He won a slam and a masters. In 2012, he played 2 GS finals, won one, and won 2 Masters despite only playing 6 months that year. In 2013, he played 2 GS finals, won both of them, and won 5 Masters titles. In 2014, again playing part time, he played 2 GS finals and won a slam and Masters. In 2015, he played 0 GS and didn't reach a single semi. He also won zero Masters. Which, in Mastoor, language, means the difference is "not by much."
But please, keep lecturing us about facts.