I think the Heat were probably more talented, but throughout this series I couldn't help but notice that the Mavs were playing like winning this thing was more important to them than food, shelter or water, as if their lives depended on winning ... The Heat definitely looked like they "wanted" to win, but I never saw the desperation and effort in their play that it was going to take to match or exceed the Mavs.
It's a little bit shocking to me to think that the Heat couldn't muster any more intensity.