Is the US Economy as week as many think?

We often hear, about many problems with the U.S. economy -- investment rate, US deficit, etc. And the solution is is to cut back on spending and change the way we spend and save. Right?
However, according to Business Week things are not as bad:

"What if we told you that businesses are investing about $1 trillion a year more than the official numbers show? Or that the savings rate, far from being negative, is actually positive? Or, for that matter, that our deficit with the rest of the world is much smaller than advertised, and that gross domestic product may be growing faster than the latest gloomy numbers show? You'd be pretty surprised, wouldn't you?"

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