Intellectually smart people sometimes analyze so much that they delay taking any action while creating for themselves a great deal of mental work and anxiety.
Psychologists and career counselors have found that people's ability to cope with and adapt to setbacks when they occur is a major predictor of overall happiness and professional success.
A research scientist can differentiate a lab's approach not just by quality--which certainly is important--but also by the "flavor" of the work: the approach to problem-solving, the tools used, and intangibles such as originality and creativity.