If the waiting areas in MAC are full, then the only place the customer can wait is the hallway, which is awkward as usually no customers want to see each other. Thus it's totally reasonable for Angela to tell the customer to come back later if the waiting areas are full, or if she expects it to be full within the time you are waiting because you arrived too early, and this waiting time is long (say 30 minutes). It's certainly not a reflection of bad service, but good service in considering the fact customers don't want to see each other. Plus there are plenty of outside shady seating areas anyway close to the shop.