66-16 is nothing to sneeze at... that said, this is the playoffs. Win or go home. You cannot underscore the importance of playoff experience... in particular deep into the playoffs. You don't win series in the playoffs with a regular season mentality. The Celtics don't have big playoff experience so despite their impressive regular season record they are basically on the same level as teams like the Hawks or Cavs. That said, they did dominate the regular season to the tune of 66-16 so the quality is there. They are learning and getting tougher with each obstacle overcome. Need I remind you that they have yet to lose a playoff game at home.