If you thought that the Celtics were going to win 52 games as was discussed in another thread, then you need to overreact. If you thought that the Celtics were more in the sub-40 range and fighting with Indiana, Detroit, Milwaukee, Washington, etc. for the one last playoff spot (as I did) then nothing so far surprises you.
This is what the Celtics are this year. They will get hot along the way and win a stretch of game, getting everyone excited, then lose a stretch (rinse, repeat).
The play of Lee, Turner, Zeller, Crowder, Bradley and Thomas has not surprised me at all. These guys are what they are. I am a little disappointed with Smart and Sullinger, I had hope to see more development. The rest have not shown enough to know anything yet.