Never had a bad job. If I had to pick one it would be working in the offices for a double glazing company* when I left education, but only because the pay was a pittance.
All my other jobs, and that one, have been great for me but as with Mark the downside is the hierarchy.
Edit: *the factory staff, most of the office staff, and the fitters were excellent. The managers left a lot to be desired (the company went bust about six months after I left), but the least trustworthy bunch of bitching, back-stabbing, barstewards was the double glazing salesman. I only liked one, who was a bit quiet, almost wet! Luckily I liked him as he's the husband of one of the doctors at my local surgery.