You're not impressed with Djokovic's dominant 2015, correct? Why would you be? You're not impressed with Roger's accomplishments because he faced weak players, so surely you're not impressed with Nole's 2015 accomplishments for the same reason. His main rival has been Federer. You know, that past-his-prime player whose greatness is highly exaggerated. Nadal, Nole's other main rival, has been missing-in-action all year. That leaves mental-midget-against-the-Big-4 Murray, stamina-midget Nishikori, physical midget Ferrer, sometimes on/mostly off Wawrinka, one-slam-wonder Cilic, schizo-playing Tsonga, lets-put-on-a-show Monfils, inconsistent Berdych, Raonic, Anderson,...(the list is countless), and a host of 'young guns' who compete like BB guns.