This team is 26-7. All their losses have also been close games, the only one not being close was the 17-point loss to Orlando in November.
For the most part, he's made the right decisions with rotations, minutes, lineups, etc. They've also clearly bought into his coaching and even players like Jaylen who seemed to dislike him last year have praised him this season so far.
Yeah, a lot will be judged from the playoffs and the crucial moments then. But for now, I've been happy with Mazzulla. There's really not much to nitpick IMO. I mean, at some point too if the team doesn't execute in certain moments you also have to look at the players. Some of these guys have been here even with CBS and Udoka and still choked over the past 5+ years in moments.