To me, it's worst sin was how Kirk was presented with sort of a borderline personality disorder. It made sense within his character arc to give him an inner-conflict, but it was not satisfying to watch him be so uptight after years of wanting to see the band get back together.
Kirk didn't want "to see the band get back together." He "used this emergency to get the Enterprise back." That's all he wanted: to command a starship again. Sure, he drafted Bones, who promptly called him on his shit. Then he got Spock, who gave him the cold shoulder. He's perfectly in character throughout.