The Celtics have played 2 games and I'm already seeing some pretty classic overreactions and jumping to conclusions from fans.
One game was an easy win against a terrible (and undermanned team). The other was an ugly loss against a playoff team. The preseason started telling us some of the story, but most of the information gathered during that time should be set aside (unless enough of the trends continue during the season for us to draw conclusions from.
Everyone should understand the concept of small sample sizes. Jordan Mickey's 78+ PER probably isn't going to stand up when he gets a few more minutes.