It can be easy to get caught up in the negativity of losing streaks. Likewise it can be all too easy to get carried away with a winning streak.
The easy thing to do after a game like this is to proclaim that the Celtics have turned the corner and are well on their way back to being among the elite teams in the NBA again. A quick look at their upcoming schedule will give fans hope that this may actually be the case, as they have winnable games coming up against the Cleveland Cavaliers (twice) and Toronto Raptors before the schedule will begin to stiffen again (the Lakers, Bulls (x2), Mavericks, Thunder, and Grizzlies all are on tap in February). However, I would caution against getting too carried away with the teams current winning streak.
... the lesson here is not to get worked up over a sample size of four games. Players can get hot and teams can get hot, but as Celtics fans should be fully aware by now, it's the ability to play consistently well against the elite teams of the league that separates the haves from the have nots.
Are the Celtics "back" now? Too early to tell. I like the direction they are going though. For now, that's enough.