>>Right, and that equals postseason success.<<
Oh, please. Everyone has playoff meltdowns, including the beloved Spurs:
Serious meltdowns include 1978, 1981, and 1991 (each time lost as a 2nd seed in their first playoff round) and 1995 (top seed lost to 6th seed Rockets);
Minor meltdowns include 1994, 2006, and 2009. This doesn't include other years where the Spurs lost to a lower seed (1994, 1996, and 2001). I wouldn't automatically label losing to a lower seed a meltdown, especially deep in the playoffs. But a 1st or 2nd seed not winning a playoff series (even before everyone played in the first round) IS a meltdown and there are many good teams that have these, not just Dallas and SA.
The Mavs have only lost to a lower seed in any playoff round 3 times: 2007 as a 1, 1987 as a 2, and 1985 (4/5 loss). 2007 is clearly an aberration. A bad one, mind you, but one still.