Yes, Manu was definitely a shadow of his true self in this series. He was worn down, injured, and had no lift in his legs. That is why he couldn't finish around the basket.
But as I've said on this message board, this is part of the challenge when a team is trying to defend their le. They have to deal with the physical wear and tear of making it all the way to the finals the previous season, the challenge of taking everyone's best shot from Day 1 opening tip off for the entire regular season, and then have the for ude to make it all the way through the playoffs and win another le.
That is specifically why the Spurs have never been able to excel from a very good team (that can win a le here and there) to a great team (that can take everyone's best shot, and still win). The last great team that we had in this league were the Lakers from 2000 - 2002. All NBA champions afterwards have come no where near the level that team was at.