We're talking about THIS year not last year. Right now, the Celtics are #1 in play this year, and the Pistons #2.
Also Boston is almost as good on the road as they are at home.
There are a couple of teams out there that are potential contenders, but Boston is on top. What isn't clear is who is really the best team out West. We'll probably have to wait until the playoffs to find out who. And whoever gets out of the West is going to have to go through a gauntlet of good teams.
As a Sixers fan, it seemed every year the Sixers were able to contend, they always had to face Boston first. It was so difficult to get by the Celtics, that the Sixer's were exhausted and lost to inferior teams like the Lakers who were waiting with days off, nice and relaxed. Boston fans felt the same way about their team getting softened up by the Sixers before they faced the WC opponent for a championship. Who knows how many more titles they would have won if they didn't have to go through each other first?
Well, this year, the tables have been turned. The East has 2 good teams and the West is filled with them. Whoever gets out of the West will probably find Boston waiting for them, holding home-court advantage. It took a long time for this change to come around.