apple and oranges. it's silly to compare Sereana with Fed or any woman with any man. Men and woman don't even play chess toghether and chess in intellectual sport (no athleticism involved).
Serena simply overpowers her opponents, and there is nothing wrong with that. She simply doesn't have any competition and that's also not her problem. The rest of the women on the WTA tour are pretty clueless but it is what it is. Men and women play 2 different sports (yeah it's still called tennis but nevertheless).
Judit Polgar was ranked number 8 in the world in 2005. But in physical sports its no contest between men and women.