Among billionaires maybe he is on the good side. But in general?
Linus Torvalds did more for the world than Bill Gates, IMHO. And he didn't need to set up a system that first appropriates money in order to "be generous" later.
What diseases has Gates eradicated? Polio has been surging back and nOPV (which Gates stands to generate a lot of personal wealth from, by the way) has been a bit of a bust. Measles is going strong, too, and Malaria seems to have been a bit of a token effort for Gates.