Well, I've never had any of the crashes and hangs and instability of which you speak with XP or Vista or Win 7.
As to the durablility of a Mac, I have a good friend who has managed to destroy five Macs in six years and he is neither a power user nor particularly computer literate. He is a Californian and a Starbucks fan.
My point being that neither system is perfect and people should use what they want without jumping on some bandwagon about how brand X is SOOOOOO superior to brand Y.
It's a tool. Be a Steve and not a Stu. The Dude must abide and all that.