In the tournament opener at Eden Park in Auckland, the All Blacks ran in six tries against the South Sea Islanders with Israel Dagg (2), Richard Kahui (2), Jerome Kaino and Ma'a Nonu all crossing and Dan Carter kicking three conversions and a penalty.
Kahui, Sonny Bill Williams and Kaino were outstanding on the night but New Zealand's second-half performance did not match the incisiveness of the first 40 minutes.
Some disjointed attacking play and an under-pressure scrum contributed to the All Blacks only winning the second 40 minutes 12-7.
But McCaw told ITV1: "It was a start, we had good patches, but in the second half we spent some time in their 22 but didn't capitalise, which is something to work on.
"Our defence was good, although it was disappointing to let them score, but we had had to defend for a while. But it's a start and that's all we can look at it as."
The Crusaders flanker was not overly concerned by the nature of his side's second-half performance, putting it down to over-excitement after the long wait for the tournament to begin.
He said: "It can happen when you are a few points up that you can expect things to happen when you make breaks instead of being ruthless. But we created opportunities and for the most part I thought it was good stuff.
"We are excited about getting under way, it's been a long time coming and to play in front of a crowd like this is pretty cool."
Gilbert has released a new line of rugby cleats. The Gilbert Virtuo 8S is part of the exciting new product. Check it out.
The entire All Blacks apparel line has been updated for 2013/14. Check out the New Zealand All Blacks polo.
The Nike Tiempo is a solid rugby cleat and one of few styles still made from full-grain natural leather.
The Gilbert Blitz 8S rugby cleat is a great cleat at a great price of $69.99. Get a new pair of cleats today.
A cool looking all black rugby cleat with the high performance adidas is known for. Get in the Gear!
Wear the crest of the British and Irish Lions on your t-shirt. A great look for the summer.
The All Blacks Performance t-shirt is black with hints of blue from the training jersey. Very Cool.
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The USA Rugby Pro Alternate rugby jersey is perfect for any fan of the Eagles. Get yours to wear during the summer Test matches.
The NEW All Blacks 2013/14 jersey has arrived at World Rugby Shop. Dare to wear the colors of the All Blacks.