I do think personality is extremely important long-term in landing a good job and having success in it. I graduated with honors from harvard Medical School (which was almost impossible to get into- they only take maybe 10% of the applicants). Although obviously everyone was very, very bright, long-term it's been interesting to see how my classmates have done.
Even as a doctor, which I always think of as being like a scientist (ie, personality isn't critical; brains are key), some of the people from my class have done very poorly with their careers, due to their very poor interpersonal skills. Conversely, some people who were smart but nothing special have done extremely well due to being hardworkers and/or good communication and personal skills.
