The one quality which disturbs me about choosing people is on the basis of their past experience and work. Rather what is required is to be unrealistic about the future. The people in the realm of success are not one whose success is defined by some past successes or work but rather the people who are bound to think out of the box and remain calm during the steps to achieve some Great future endeavours.
Extroversion is much hyped in the outer world as the face of success.
Even me as personally during college days used to think that extroverted people are great achievers. Since all the time they are hanging out with people, they are gregarious, outgoing easily and you can count ample amount of particulars with them.
The world with all the people in it wants to be as outgoing as possible.