3 point barrage? Maybe in that one game against LA, but its not like they were just shooting lights out on 3s all playoffs long. They certainly hit timely 3s, but its not like it was constant fire. They shot 39% as a team from 3 through the playoffs. Take out that one ridiculous game against LA where they hit 20 3's, and they are down around 37% for the playoffs, only 1% higher than their season average. People tend to remember that incredible shooting game (where the Lakers gave up and weren't even playing defense), and Terry hitting that 3 in Lebron's face in game 5, and think that the Mavs were shooting like that the entire playoffs, but they weren't. They just had people step up with big shots at the right time.
And while Dirk was dominant in that run, it was really no different than how much he had dominated the previous 3 playoff runs. The only difference was that his team was stepping up when he needed help, where in the past he was pretty much doing everything on his own. But statistically, he was equally or more dominant basically every playoff run since the Golden State fiasco, when he finally began to develop a more consistent post game to take advantage of smaller quicker defenders. Arguably, his most dominant playoff series ever was against Denver in 09, where he was completely raping them at will. But unfortunately, his starting lineup consisted of Eric Dampier, an injured and mentally destroyed Josh Howard, and Anthony Wright. Not much you can do when your teammates are completely worthless for an entire series, and allowing Carmello to drop 40 a night with incredible efficiency.