Jay Cost at RCP with America is not Ungovernable. A quote:
The solution the country ultimately settled on had five important features: checks and balances so that the branches would police one another; a large republic so that majority sentiment was fleeting and not intensely felt; a Senate where the states would be equal; enumerated congressional powers to limit the scope of governmental authority; and the Bill of Rights to offer extra protection against the government.
The end result was a government that is powerful, but not infinitely so. Additionally, it is schizophrenic. It can do great things when it is of a single mind - but quite often it is not of one mind. So, to govern, our leaders need to build a broad consensus. When there is no such consensus, the most likely outcome is that the government will do nothing.
The President's two major initiatives - cap-and-trade and health care - have failed because there was not a broad consensus to enact them. Our system is heavily biased against such proposals. That's a good thing.
Yes, it is a good thing. And, in general, government doing nothing is a good thing.