Frankly it can't be any worse than a mediocre data entry job on 16k, which is what I currently get to experience. Teeny bits of research here and there but mostly just type, type, type.
If I get to so much as contribute to patient care, then I'm in love with it. Doing the odd bit of skin allergy testing -- dull as **** in theory, but because I get to see patients for a change I love it. That may be swayed by the generally nice qualities of the patients who come in, but still.
I don't think that will change when I get to medical school, or as a doctor. So long as you're not expecting romanticism, an easy or necessarily interesting job, then what's the negatives? There will be more pay than my peers, because most of them aren't in high-flying jobs as it is, more prestige, more stability in the sense that I probably won't be sacked (although less in the sense that I'd have to move around).
I get the family/social issues. Maybe that's the big swaying point for most people. But in my current life and place of work I already work 12 hours a day and barely get a chance to see anyone but my girlfriend when I get home. I'm not expecting that to change, so can I really count it as a negative?
I guess we'll see.