That depends. Sometimes martial arts is done as a team sport. For instance, at tournaments they've got team katas. Or a particular dojo might compete as a team. Sure, martial arts is less of a team sport than other sports such as football and baseball but it can still be done as a team sport depending on how its done. Some people might disagree with you. Some of the people on this forum post messages where they make training in the martial arts sound like being in the military. I see where you're coming from. No instructor is perfect and there are times when even the best instructor should be questioned. However, instructors have the experience, and that's why I like to follow their lessons inside the dojo. As you said, a martial arts instructor isn't necessarily better than anyone else as a person and that's why I follow their lessons in the dojo but outside the dojo its a different matter.