Tango forces you to be brave. If you are lucky enough to have a regular partner, then you can monitor each other’s developments and weaknesses. People with private teachers are paying for commentary but if you use group classes as your main learning tool (the most usual way) then it can be hard to judge how you are dancing. Have you improved or have you picked up new, bad habits?
For me, I have found that tangueros tend to critique rather more than praise. I am frequently told when I have done a step wrong with a new partner. Is this good criticism or the self arrogance of the leader who assumes that his longer learning period gives him the edge? Sometimes they are right but as I have learnt more, I have realised that sometimes they are also wrong. It takes courage to realise this and accept that I have correctly followed the lead but it has been poorly executed; that I have danced well that night and they have not.