The Phoenix Suns were the best team in the NBA during the regular season. They had the best record in the NBA at 64 and 18. They had the best net rating in the league. They also dominated the Dallas Mavericks during the first two games of the Western Conference Semifinals. They averaged 125 points per game while winning by 13.5 points per game. Perhaps that is why it is so hard for people to believe that the Mavericks were simply better than the Suns.
Many seem to believe that it is simply a fluke that the Mavericks are where they are.