Her serve in the men's game would be a normal serve.
She isn't the best technically. No way is she talented more than Federer, Nadal or Djokovic. Let alone Sampras and Agassi
She's the most talented female to play the game. But she's definitely not the most talented to play the game ever especially as a journeyman schooled her.
Its the same in football. Nobody calls the best female player as the greatest technically because the gap is huge and it's the same in tennis. With the men atleast things tend to be consistent.
Comparing her with the men's gane is moot, she's not a man, which has nothing to do with talent. Men are stronger, not because they are more talented, but because of biology. Martin Verkerk had a much bigger serve than Serena, i wouldnt say he's a more talented player.
Serena isnt the most naturally talented female is what I was getting at. She is the best because of her mental and physical strength paired with a fantastic serve and great ground strokes. A player like Hingis or Graff probably head more talent from a technical standpoint.
Also, do you rate Sampras and Agassi over Federer, Nadal and Djokovic?