Only just noticed this thread.
The reason the game has changed, as someone mentioned before, is that Federer came along and made anyone who tried to serve-volley look like a fool. The defining moment, the changing of the guard, was when Federer beat Sampras at Wimbledon.
If you know at some point that to win a tournament you have to beat Roger Federer, you change your game and stay at the baseline. Even big servers like Roddick now tend to stay back even after their first serve, because serve-volley is now redundant, other than as a variation tactic. The best players against Federer are the ones with immaculate defences, who just keep getting the ball back, no matter where he hits it. The players are now so fit and flexible that to hit a winner, you have to do something really special. Like, for example, that shot Murray hit against Tsonga (I think) when Tsonga had hit a smash and Murray returned it, leaping up in the very far corner of the court, got the ball back into play and won the point. For these reasons, tennis has become a war of attrition.
As for Murray being shit, I agree with Baboon. He's extremely unlucky to have come along now. But it's also true that he's only as good as he is because he's had to keep raising his game to keep up with Nadal then Djokovic. BUT I couldn't believe he let his head drop so quickly in the Wimbledon final. He'd resigned himself to defeat while it was still 1-1 with Federer only marginally ahead, which is ridiculous. He's as good a player as any of the top 3 in terms of shot-making, but it's his lack of fight that lets him down.