#2 Scott Hall and Kevin Nash - The Outsiders
One of the most dynamic things about the advent of the NWO stable was the polarizing effect they had on live audiences. While they were the 'bad guys', the invaders trying to bring down WCW from within, they were also smooth talking, laid back 'cool' characters.
This posed something of a problem because their job was ostensibly to make people hate them. It's hard to work a match where the hero is greeted with apathy but the villains are cheered with great enthusiasm.
To make matters worse, Hall and Nash did nothing to discourage the positive fan reactions, eschewing the normal heel tactics of insulting the crowd or their hometown sports teams.
Why they got cheered instead of booed: Scott Hall and Kevin Nash were just 'too cool' (or perhaps, too sweet) to be booed like a typical wrestling heel. Also, the time period in which they were active -- the 1990s -- tended to treat stereotypical good guys with contempt while praising thuggery and criminal acts.