Pros
Depending on the franchise you might get some decent benefits. Our franchise provided free meals, PTO after a year, advancement opportunities for good workers, and reasonable insurance. Sometimes the work environment was actually nice.
Cons
The downsides come when inevitably you're understaffed, paired with co-workers who don't care at all, and/or you get the hand of upper management mucking up things. It almost seemed like any time something was improving, somebody would come in to "make it better" and end up making it worse. Customers could be absolutely nasty and horrible. Cussing you out and calling you awful things. There were never repercussions for these customers; they were regulars and had money. Luckily overall the customers were reasonable but the few horrible ones stand out. When you have understaffed days and you're still the one who went to work and decided to put your best in, you're still the one on the chopping block when things don't turn out well. The better you are and the more effort you put in, the more likely it is you're going to be guilt-tripped and looked down on if you call out sick.