Marc Maron's performance
This guy makes the show, IMO. Sure Allison Brie is phenomenal, an amazing actress who's playing a character so well that its made me wonder if its possible to fall in love with someone who exists only on-screen. Because I'd go halves on a baby with Ruth in a dang heartbeat.
But Maron steals every scene that he's in, as far as I'm concerned. With help from some of the best writing I've seen on TV, he IS the character he plays. And who knows, maybe he's like that in real life, just that unique of a person, but the intelligence conveyed through the screen here is palpable. Every pause, every glance, he brings a level of nuance to his performance that doesn't just bring the character to life, but conveys a deeper understanding of him as a person, his motivations, insecurities...
Its just not every day that someone you've never even heard of before is suddenly at the top of your list of favorite actors. Going to find out what else this guy is in just to see what else he can do.
Regardless, they sure picked the right leads for this show.