My one complaint was when they locked the zombies in the church. There was a hole in the door, why didn't Michone just stab them one-by-one & then take the church back? Plot was too thin there for my tastes. But, it opened up the way for Abraham to ram the door, so there's that.
Like they said on the Talking Dead, they do a really good job on this show of introducing jerk characters like Dawn & humanizing them. When she & Beth killed the officer down the shaft, you realized what she had been going through & why she needed order in her life so bad. She was just approach it the wrong way. It's the same thing they mentioned about Shane - Rick is basically Shane now, but he's gone through the steps & processes to get there, unlike Shane who was willing to off people in his group.
I don't think Rick went to the dark side by killing the runaway cop. Number one, the cop ran away and hurt one of his people, and number two, that could have potentially killed many of them had he gotten word to Dawn about their situation. When Rick almost killed the cop who was fighting Darryl last episode or two ago, and Darryl talked him out of it, that really felt like he was on the line, but this was justified...he stopped a situation from happening that would have endangered his people - and through no fault of his own, it was the cop's choice to flee & also to not listen even when the cop knew he was cornered - and then did a mercy killing due to his broken spine.
Reading that paragraph above makes this show sound insane haha.