Is there anything in Personality Tests?

"You are a clear thinker. You have an inner need to be objective and analytical. You like to pursue a definite course of action. You respond to logic rather than emotion. You are likely to be particularly good at handling challenging technical assignments. You have a strong inner motivation to attain personal goals. You like to become 'the expert' in your chosen field."

Hmm - that's me according to a free online DISC personality test. Such tests are often used in team analysis and development strategies. Do you think there's a role for them?