I am going to wait for the dust to settle before I get my pitchfork to chase Mazzulla out of town. Several things appear to be true at the same time. Mazzulla is a title winning coach. He is a finalist for coach of the year, and deservingly so. Has been one of the top coaches in COTY voting every season.
OTOH, there has been some underachievement in the playoffs the last two seasons (I give him a pass on the MIA series his rookie coaching season). He has a very unconventional approach and demeanor that plays fine when things are good but will get old fast when things are not going well.
Fan perception will change a lot based on how game 7 goes. But if at the start of the season, you were told that BOS would lose in the second round to the Knicks, most would have said that was OK. The expectation changed, understandably, and now a second round loss (and certainly a first round loss) will be viewed as underachieving. But is it? How good is this team really? Has Mazzulla lost the room? These are not easy questions, and should not be decided based on heat of the moment reactions.