In the real world,you need to do something abusive to blue your discs or boil your fluid. In reality,you're going to have a much better chance of tacoing a wheel in a pothole or bad curb hop than you will in trashing your discs.

Roller brakes suck. Period. They're heavy,don't work well,and are a pain to install/remove. I mention this because they get confused with proper drum brakes all the time. I personally wouldn't run drums because I live in a very hilly area,but if you're somewhere flattish and are looking for minimal maintenance,then drum brakes are ok.