Ainge has managed to rebuild this team from the ashes of the post New Three era (We don't even need to discuss the first rebuild in the 2000s under his watch). The past 5 seasons have all yielded playoff appearances including two appearances in the conference finals. The current incarnation is 14-5, a top 4 team in the conference, & somehow managed to take the blows of losing both Kyrie & Horford. Ainge managed to mitigate those huge losses (which could've been crippling) by acquiring Kemba and the team remains a contender in the East.
Most NBA fanbases would kill for something like that. Obviously, we all want titles (and did get one last decade) but Danny has done a pretty darn good job in his profession. He's had his misses like all GMs do but he's also had plenty of successes. Calling for his firing right now is just plain asinine.