Pros
Working for the Brewers is by itself a very cool thing. During my internship I got to meet several players, be a racing sausage, and enjoy free seats whenever I wanted them. The perks were definitely the best part. The people were this internships only redeeming factor, however. See below.
Cons
The corporate marketing department hired 7 interns, which was probably 5 too many. We were constantly fighting for hours due to budget constraints, and when we were in office hours we would either do data entry or refilling posterboard for a promotion. We were never given any responsibility and the contract coordinators never let us help with anything. We essentially did the same thing the "Brew Crew" did. That is, we were glorified game day staff. If you want to actually learn something in the sports marketing industry, look elsewhere. This is one of the few times I would say an unpaid internship is better than a paid internship, because if I had not been busy fighting for hours, this could have been a whole 'nother ballgame.