McCaw's side shipped seven tries past Argentina and secured the championship trophy with a round of matches still remaining.
"It was one of our best performances this season," said McCaw.
"When we started out in the Championship the goal was to put last year behind us. We have got the tag of world champions and we needed to play like them.
"To secure the Rugby Championship was obviously the big goal and it is nice to be able to do that. We gave a performance the guys are pretty happy with. It is the manner in which we did it that was so satisfying."
The All Blacks' final test is against South Africa on 6 October.