Pros
As a non-managerial employee, you have an incredible amount of schedule flexibility as long as you're willing to work at least one weekend day (Friday, Saturday, Sunday). Customers, even upset customers, are usually easy to interact with. Free movies for employees provided there are seats remaining. Some potential to increase hourly wage. I started at ~$5/hr and finished around ~$9/hr. This is a stellar job if you're trying to supplement your income on weekends, or have spending money while going to school. As an usher, management will leave you alone to do your job, until you mess up or ask for help. Micromanagement was fairly uncommon and even though, for many employees, this was their first job, they were trusted with the responsibility of getting their work done. This leads to employees who don't hate being at work and is definitely a positive.
Cons
It can be difficult to get enough shifts during the less busy times of year. It's part time, and short of making management, there really isn't anything full time available. Your schedule will change every week. Management varies from theater to theater. A friend of mine worked at a Cinemark theater in a different state and had a bad experience, while I had a 90% positive experience. Certain jobs like concessions and the box office can get tiring for people who need more mental stimulation. Room for advancement is there, but the lack of positions means many employees move onto something else. It is corporate and all that that entails. Nevertheless, if I could live off the wages, I would gladly work there again.