I'd like to disagree with this if you look at the best mens players they are good servers but not reliant on the serve. Federer and Djokovic are all court players, Nadal is frequently criticized for not serving well enough. From there Davydenko, Ferrer, Hewitt, Nalbandian heck even Jams Blake would rather use other weapons. Roddick may be the only player at the top of the rankings who is dependant on his serve to win. On the womens side power and shorter points has been the trend with Sharapova and the Williams sisters, Henin has also changed her game to shorten points. Not that either is better than the other it's just different