Federer, Nadal and Djokavic are way better than the guys in Aggassi's era. Federer is the GOAT, Nadal was thought to have a chance to be the GOAT, and now Djokavic is dominating.
If there wasn't Nadal and Djokavic, give Federer Andy Roddick, Hewiit, even Murray, Federer would make another 10 grand slams.