Machiavellianism: What kind of strategy is that?

Machiavellianism in its simplest form is a person’s tendency to deceive and manipulate others for personal gain. Doesn’t sound very Nice, does it?
Yet there is a political doctrine that has arisen based on this notion.
Here are some quotes from the website BuzzFlash.com:

Machiavellianism: The political doctrine of Machiavelli, which denies [...]