Yeah a lot of factors contributed to that, he admitted in an interview a while back that he was playing very angry basketball the whole season, including the finals because of many different reasons. One of them being the on going bashing from people about him leaving Cleveland, and problems he had with the management aspects of the Heat team.
But since his summer training with Olajuwon, he has improved on his low post game, and you can def see it this season. He posts up more, has more handle, (for a guy his size 6'8 260lbs) and the whole team in general have a great chemistry. Wade is there to compliment him as a great player, and the rookie this year Norris Cole is a real notable player. And cant forget about Bosh, hes like the silent of the Big Three, probably the most down to earth as well. I think if they keep the same tempo that they have going now, and play with the same intensity on the fast breaks, get high percentage shots, they should be able to clench this finals win. I have a feeling, I really do, I think this is their year.