Salary:
A standardized $15 dollar per hour salary leaves something to be desired when working in downtown Manhattan. However, since this is much more an education program than a job, the fact that you're getting paid at all is nice.
You are auditioning for a new position:
You are not automatically hired at the end of the program. Working hard, being open to learn, and seeking a position there are openings for all contribute to whether or not you will get another position at MediaMath. If not, many companies in the space see MEP as a valuable experience.