LOL. That last part is a wonderful weak era view that is not backed up with any facts. I'm surprised you aren't aware of the changes in his game, or at least would acknowledge them. The jump from 2013 to 2015 in the stats is huge. How is Federer magically wining more first serve points these last few years (better than his peak)? Did everyone suddently forget how to return on tour? Open your eyes. It just doesn't fly. The tour didn't fall off a cliff; Federer improved greatly.
The eye test is a lie if you don't have the complete picture. A great fan like yourself may remember the past so well that you just compare and see only Federer's obvious losses in movement (and the stats show he's not playing as well in facet's of the game). I don't have an agenda, but a lot of Fed fans on here seem deadset on degrading Djokovic's slam domination. As a group, I see little or no mention of improvements to his game and that's a shame.
I do believe your eye test on decline in 2007 because the stats back it up. Of course losing matches to Djokovic and Murray are going to hurt his stats some; kind of a mathematical fact. But the losses to Canas boggle the mind.
I know in 2009 Murray had great hard courts stats and those victories over Fed early in the year helped him have better points stats on hard courts than Federer, but I am not really seeing that year as a great field. I watched then, but in hingsight I don't know how Murray had some of his far an away best hard court numbers and then we call the hard court field strong. Murray and Djokovic were not in their primes.
I'll buy 2012 as the greatest field especially for the top 4 players. I'd rate 2011 highly too for that matter. 2013 was weaker because Federer did not play well at all and Murray was gone after Wimbledon. 2014 was weaker too with Murray on the mend from back surgery, Federer improving with Edberg and a new racket, but we had Wawrinka. 2015 and 2016 look stronger to me than 2013 and 2014.
Fed's 2016 stats on hard courts which are from Australia are very impressive. Those are the slow ones.
Its why I am full of hope for him to make a strong run on US hard court season.
The weakness is in the lost generation and I'm happy enough with how Goffin and Raonic are performing of late. Strings have made a huge difference to the game and I laugh and laugh at the fools on this site who keep going to the well on the minor court alterations made at some of the majors.
Here is one excellent discussion of the impact of strings and on the "weak" next generation:
https://sports.vice.com/en_us/artic...ow-new-technology-killed-american-mens-tennis
The following explains how strings also trump what people are "seeing" as court speed changes:
https://fogmountaintennis.wordpress.com/
If you understand what is holding the youngest players from breaking into the game, then you'll realize that 22 is starting to be the normal time for players to start to emerge. We are having an early bumper crop of young talent looming:
1. Vesely
2. Pouille (21 in the world), phenomenal play at Wimby
3. Zverev (27 )
4. Kygrios (18)
5. Tomic (19) excellent Wimbledon play
6. Thiem (9) won tournaments on three different surfaces this year
Pretty soon that may well be 5 younger players in the top 20. So much for "weak".
Wake up metsman; the Federer and next generation glasses are half full.
Enjoy.