Everything works. I'm not the best at anything, but I can do just about anything adequately, I've had some pretty bad injuries, but everything heals right up and I've never lost any functionality as a result. Nothing hurts or limits my ability to do things in daily life. I don't have any allergies (food, hayfever, drug, etc.), I can stay awake and keep working for a couple of days when I need to, I can do sets of deadlifts with respectably more than twice my weight and then bike a century, I'm reasonably energetic from the moment I wake up until I go to sleep, and a lot of the time I think I'm the only person I know who doesn't suffer from depression and is on at least some kind of anti-depressant medication.
It'd be nice if I did have some one, great, amazing quality, but when I think about how everybody I know has at least some problems (bad back, knee problems, etc.), just having everything always do what it's supposed to do without complaint isn't such a bad thing.