Basically, Kevin wanders around with a look on his face that makes it look like he needs the bathroom, a good, long book, and some privacy because he'd been saving up for this one.
That's the EE ads, isn't it?
I think it's the 'tortured soul' look they learn at Acting School. The dread weight of the backstory that he must lug from scene to scene. I survived five series of
Lost, I have the badge and everything, but five episodes of
The Following had me in tears. I don't know if it's the epic dumbness of the police and FBI (I want Scully to turn up and stab each and every one of them with her shoe heel), every movement is lubricated by stupidity, the suspension bridge of disbelief I have to cross to accept the cult of serial killers with unlimited powers and resources (which was organised by a notorious serial killer from inside prison, because like no one bothered to check the visitor log), or the constant
deus ex machina plot lines (what do you know, new character turns out to be a cult member). The Gods are practically parachuting onto the set. Then there's the dull splatter of pointless gore and finally, but not least, the constant hey-we-read-a-book Poe references. See, it's all based on Poe. Except it isn't. They just pick random phrases and run with them and hope no one notices they only read the Cliff's Notes at college.
It's like some huge vacuous mental burp. Watching it is like breathing their stinky mouth farts. Those EE adverts are a lot better.