What do people think of Andrew Lincoln's portrayal of Rick?
For me he isn't quite convincing. The Rick from the comics slowly adapted to a world filled with zombies and won't hesitate to do what needs to be done even though it wouldn't quite square with his previous life as a cop.
It may be to do with the way the character is written for the TV show or it may just be Lincoln's performance but he hasn't really portrayed how the character's moral boundaries are being loosened. He's still stuck in pre-zombie-apocaplyse Rick mode.