I find it hard to beleive the mavs would win 3 in a row from a team that has beat them 8 of the last 10 times.
The Mavs regular season record (not counting the Warriors) was very impressive. They are big, have some good shooters, and have depth. Usually they have a good defense.
One of the problems the Mavs have is that they rely on mismatches too much. In the Warrriors, they are playing a team where the smallest opponent is 6'3" 215 (Baron). The Mavs shot only 43.8% from the field due to hitting just 9 of 25 three pointers and not getting a lot of layups.
On the flip side, the Mavs vaunted defense is getting sliced up and the Mavs have been fouling a lot. The Warriors took 37 foul shots and if they had connected on more than 24, it would have been a blowout.
But the Warriors hit only 12 of 37 three pointers. It seems likely the Mavs will try to pack the paint and hope the Warriors stay cold from beyond the arc.