I think so. Houston looked very good in that game. Although Miami deserves it's props for not lying down, Houston wanted it more and played better.
The turning point in the game came late in the fourth quarter, when T-Mac decided to make things happen, he shot a couple of three's and genrealy shifted the momentum to the Rockets.
The Rockets proved that they have the depth to handle Miami. Shaq is better than Yao on most nights, but Deke is better than Doleac or Mourning most every night. With this win, Houston established themselves as a serious contender. As they meet other front-runners during the resst of the season, we'll get a chance to see how competitive they can be.