Are the Suns underrated defensively?

Since the suns play at such a fast pace, it's misleading to judge their defense based on the overall number of points they give up, rather than on efficiency or field goal percentage defense. It's unrealistic to score 120 and hold your opponent to 80 every game because then you end up winning by 40 or 50 points. There are plenty of teams that give up less points by holding the ball rather than because of their defensive abilities, which is why they don't win as much as the suns. If you look at the teams that won multiple championships like the showtime lakers and jordan's bulls, they had both good offense and defense, not just good defense. Great offense is the reason why the suns are undefeated when holding opponents below 100 points.I don't remember the knicks and heat of the 90s ever winning any titles.