There are a lot of coffee types that you can see right now. Some of them are easier to make than others. The espresso is known to be easy to make because it is a shot of black coffee. As more and more types of coffee are created with espresso as a base, it becomes more complicated. There are some coffee shops that are known to be reliable as Starbucks.
The fact that it allows their customers to have their coffee made the way that they want it can make a lot of baristas unhappy. There are some orders that take so long to make because of the number of requests available. A frappucino may be harder to make because it involves milk, a lot of cream, and sugar.