9. They're marketable.
"Marketable" can mean many things. Inside the organization, it means "likeable." Exceptional employees are well liked by co-workers. They have integrity and leadership skills (even if they're not in an official leadership position) that people respond to. Externally, it means they can be trusted to represent the brand well. Managers know they can send these employees out to meet with clients and prospects without worrying about what they'll say or do.