Pretty difficult to answer such a broad question, but I'll give it a shot.
I love my job and couldnt imagine doing anything else. I love that it constantly challenges me, and each day is different. I get a tremendous amount of satisfaction from what I do.
Now, that being said, it does have it's difficulties. Long hours, working holidays, middle-of-the-night-callouts, mediocre pay all take their toll. It's especially hard on your family.
Even with it's downside, I would never change what I do. I look forward to going to work every day...
What is your major malfunction, numbnuts? Didn't Mommy and Daddy show you enough attention when you were a child?