I don't really like Boston teams, but there is nothing to really dislike about this Celtics team. When the worst thing I can say about the players on a team I dislike, is that I feel Jayson Tatum gets / got away with too many pushoffs (back when the Raps were competitive) that's pretty darn good.
They nailed the core draft picks and then Brad Stevens had a masterful few years in reshaping the "supporting" core of the team -- be it the Derrick White trade, the Holiday trade or the Porzingis trade. And they are all professionals with no real issues in the past except Porzingis (and that was not with the Celts).