Sheldon Cooper who?
Jim Parsons gets a lot of accolades for his role as Sheldon on The Big Bang Theory, portraying a quintessential geek.
It's not that he's bad at it, he's actually pretty funny, but two seconds of watching Martin Starr do his thing as Bill shows how far off-base Sheldon is. It's nothing to do with Parsons, really, it's just that Sheldon Cooper is a mainstream pop culture palatable geek but Bill is the real deal. That's what a geek really looks and acts like, with all his charm, idiosyncrasies, foibles, hang-ups, and blind-spots.
It's a great character and a great performance by Martin.