The best part of this job, by far and away, is the opportunity to work with extremely talented and enthusiastic inventors. In general, patent law is fun because the patent agent/attorney generally deals with happy, optimistic, and creative people. I often tell people that patent law is unique in that I only deal with happy people. There is no nastiness, fighting, heated arguments, or bad feelings. I suppose that may not be true when dealing with some examiners at the USPTO, but my experience is that a vast majority of the examiners are civil, intelligent, competent, and want to find a good solution.
Over the course of a year, I may have personal contact with maybe a hundred or more inventors. In many cases, these people are solid engineers, scientists, or developers who have identified a problem and solved the problem in an elegant manner. These inventors are the bread and butter of my day to day job, and they are always pleasant and responsive and working with them is a joy.