I think the most overrated and misunderstood virtue is humility.
I think that humility has been misused to cover up fear, cowardice and faithlessness too many times.
Jesus was considered the most humble person yet he had no hesitation to do the following:
1. He called Herod "a fox". (Luke 13:32)
2. He cursed a fig tree.
3. He said "all authority on heaven and earth has been given me..."
4. He said that "we can ask of anything..."
And I can list a dozen more instances.
Humility means that recognize that we should serve others, not reducing ourselves or engage in self-mutilation or deprivation. It means that we recognize that our fellow men are deserving of respect, love and our help. We do not serve others by reducing ourselves. The Bible calls this false-humility.