Just because you are showing up and doing the work it doesn't mean you're the best employee.
What's your intent? What's driving you?
To be a great employee requires more than a drive for success or prestige. It requires real intent.
Employees who are driven by the desire to please, and to improve things in a situation or for another are the truly great employees. Amy Rees Anderson shared an insightful parable about oranges in a recent Forbes piece. Give it a read and find out which kind of employee you are.