Pros
The work is easy, you generally work with high school kids so it's a laid-back, fun environment. You get away with doing below-average work or calling in sick often because employees are interchangeable.
Cons
There are tons of employees and tons applying all the time. Basically anyone that walks in the door can do the job you're doing and will be hired if they apply. They don't notice if you're doing an awesome job or a poor job. You only get 50% off food WHILE YOU'RE WORKING (or 30 min before or after a shift) and NO ADDITIONAL DISCOUNT when you're off the clock (completely unacceptable for a restaurant, especially such a crappy, cheap one). They're very cheap and do everything possible to cut costs, including, at my Burger King, throwing away free employee meals (given as reward coupons when drive-thru time was under 2 minutes) if employees forget they've won one or accidentally leave it on the board long enough for the owner to notice.