I liked that scene.
I also liked that scene. For people that are unfamiliar with the source material it was how they established an emotional connection to these two characters. For my wife who has no idea who these people are it was an important scene. Without that scene her death would have been meaningless. Now if you have a problem with how the dialogue was written I can understand that. I thought it was also acted well by the two of them.
Just a terribly forced scene. Of course it was there to give Amy's later death more emotional impact, but it was just so blatant that that was what they were doing. It came off horrendously. Stilted, forced, and disappointing, especially considering Kirkman himself wrote that episode.
My take was that it was an opportunity for them to start to come to terms with the fact that the rest of their families were either dead or zombies (or both, I guess). So, as siblings they maybe would be a little sappy and maudlin reminiscing about dear old most likely dead dad.
I'm not disagreeing with your assessment as much as I am going back to the facts that (1) the TV show is going to have to have this type of scene to keep people interested in the characters; (2) the show needs to not wallow in the misery of the situation; and (3) they want lots of people to watch, not just zombie/comic nerds like us that have no problem with the sense of impending doom, because we have been gobbling it up for 80 issues.