Amy Schumer - Has a career because most women aren't funny, super famous Senator uncle, and got in tight with the NYC comedy community which gave her instant cred and a good source to steal from.
Never cared for Russell Brand.
Robin Williams - Status as a stand up has grown since he morgue trucked himself, but he wasn't a funny stand up. Decent actor though.
Sam Kinison's legacy is far bigger than it should be. Wild guy in a business of wild guys, but a good, not great comic.
There a ton from this new generation - Samantha Bee, Iliza shlesinger, Aziz, etc....