Unrecognizable, too much added simply to artificially keep Rick from Lori and Carl. Not that it has to stick with the comic, but the sex scene is enough of a dramatic sticking point for Rick and Lori to deal with. (Imagine what Lori and Shane would feel seeing Rick alive after they'd made love that morning, that's some guilt/high emotions.) Too many zombie cliches (I never had a problem with the hospital bit knowing the history of the comic, but dressing up like zombies? It was cute in Shaun of the Dead. But that part was painful to watch.
Maybe I shouldn't want to hold them close to the comic. But a bit I don't understand why they changed from the pilot was the zombie encounter just as they left the police station. Shooting the zombie, the father said to Rick to save the bullet because he'd need it later. Rick agreed.
Then, a few panels later, on his way back, he shoots the legless bike zombie that was stuck. So the bullet was saved for a mercy mission. Instead in the pilot we have Rick kill the zombie because he knew the guy, but it was just an excuse to show a slow mo gore scene, and then go and administer the mercy killing. Maybe it's a small point and I didn't even notice it until I was just skimming back over the comic.
Seems like a misstep to me, but they have plenty of time to establish a stronger story.