Duncan isn't averaging 25 ppg, 14-15 rpg, 5 assists and over 3 blocks like he has some years in the playoffs (aside: Duncan was a beast), but he is still ringing up 13 pts, 10 boards, and 2.8 blocks per game while shooting 53.5%. Not his fault they are losing. It's also not Manu's fault, because he is working his tail off to win games.
It seems like all the Spurs players are either really young or really old... not many of those guys who have been around 3-8 years and are truly in their prime.