No employee is simply talented or mediocre or bad. Everyone you meet has strengths and weaknesses. Some people's strengths aren't in demand every day, but crucial when called upon. Others have weaknesses which rarely appear, but are terribly damaging when they do.

And everyone is drawn to the company of others in the workplace based primarily on interpersonal factors, not others' ability or performance or lack thereof.

Certainly, there are toxic personalities which can poison an environment, but they generally have some valuable assets as well.

Deciding to leave an organization because of its people is never a simple calculation.