The guy spent his entire life accumulating massive amounts of wealth, spent virtually none of it, and is now using it to make the world a better place. What don't you find amazing about that?
I think he's a somewhat odd case, in that accumulating wealth, rather than the wealth itself, is what he finds interesting. He doesn't seem to have any particular desire to build huge mansions or leave a multi-generation legacy or anything, but really likes running Berkshire Hathaway. He did it well enough that he now has a huge pile of money that he doesn't really need or even particularly want, so now wants to find something useful to spend it on.
I agree in general.
But it seems you put a lot of weight on donation part.
Donating to charity is OK activity.
Gates Foundation is probably one of the best charities, but donating is not nearly as important in comparison with Buffet's contribution to the society while he was making his billions.
The billions Buffet made is a rough indicator of how much he contributed to the society. If he did not contribute -- he wouldn't make his fortune.
Buffet also shared his investing advise, which is extremely valuable.
So again, in comparison with what Buffet did already donations themselves do not look as amazing.
The greatest thing either of these men have done with their lives is commit to philanthropy. Everything else pales in comparison, and the biggest impact they will have on the world will have been through their philanthropy. They'll be remember for two things: being filthy rich, and what they did with those riches. Little will be remembered about either of the men personally, I dare say.
Tell me, downvoter, what Bill Gates and Warren Buffet have done that will be more memorable than perhaps in a few years having wiped out malaria? Windows Vista? The Zune? Buying Gillette and Geico?
Downvotes contribute nothing to a discussion, and without commentary they serve little purpose, save to inform the downvotee that you have something against what they said yet felt disinclined to share it..
The present world have more software freedom if Bill Gates wasn't the one who helped put a computer in most homes in the developed world, but he was still an instrumental individual in the computing revolution. Like Andrew Carnegie, he will leave a legacy with a complicated narrative.