The Pacers were willing to do what every other team wasn't last season, and that is what made them so great.
The Indiana Pacers may not be the most stacked team in the NBA, but they are among the most successful because of their willingness to do what other teams around the league are not willing to do. This especially includes double-teaming the opposing team's best player in full-court pickups and applying pressure for the duration of a full game.