A great design is often a reflection of the team behind it. To build and work with a team that creates great products is a very inspiring thing.
You must have knowledge of how to design products that are pleasurable to use, easy to understand and effective to implement and off course be passionated over what you do. But you also need a deep understanding of business logics and politics in large organisations. The tricky part is to get your great ideas into the final product, not to get the great idea.