"I'd probably give that an eight out of 10," the coach said. "It was a really good start with some improvements to make."
Jason Robinson became the first former rugby league player to captain England, filling in for the injured Jonny Wilkinson.
Josh Lewsey and rookie winger Mark Cueto both scored twice and there were tries for Mike Tindall, Charlie Hodgson, Will Greenwood, Lewis Moody and Hugh Vyvyan in his first cap.
Hodgson and New Zealand-born Henry Paul, making his first start, could make only five of 15 conversions between them.
"To score 70 points and to concede none was certainly our target and we are happy with the win and we now need to move on," Jason Robinson said.
It was Canada's worst loss in eight years, while Japan endured its worst defeat since the 1995 World Cup, when the All Blacks won 145-17.
In Perth, Scotland overwhelmed Japan with a hat trick of tries from Chris Paterson and two apiece from Hugo Southwell and Robbie Russell among their 15.
Next weekend, England host South Africa, France meet Argentina, Wales take on New Zealand, Scotland play Australia in their second test, and Ireland plays the US.
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