No, he wasn't out in Africa giving meds to people with AIDS, but not every one working for a charity is working in a chartable capacity, whatever that means.
My take from what was has been said about his position publicly, is that is was in a PR type position. If people are going to donate to the Clinton Foundation, the better pubic image of Bill and the works of the Foundation, the more people are likely to contribute (in theory anyway). Helping the Foundation raise money indirectly as a PR person is important in any charity - maybe not as important as the doctors and people on the ground, but still I think it is unfair to dismiss it as not being hands on in the charitable work itself.