Not really. In his eight years on tour this year has been his second most successful. If you call this a bad year then he's only really had one good year on tour. When you look at all the other players who have had one slam seasons – this one compares favourably well against all of them.
I'm pretty sure that's not hows view it himself. He's not comparing himself to folks who managed to have one good year. He sets Natal and Fed as his standard against which he will be measured, not to one season wonders of the past.