As someone who just never ended up watching that much Rondo (didn't watch the NBA 10 years ago when he was winning the chip with the Celtics, didn't watch Sacramento or the Bulls last few years), I obviously knew on an intellectual level that was an elite PG and had heard all the stories about his IQ. I'd seen the highlight clips and some big games. I knew he was an elite point guard.
But man, seeing it in person game after game is something special.