The issue I have with the drawn out scenes is that we know whats coming at the end of it. There is no interest in the back and forth because they are saying things we have heard before.
Even the endings have turned out that way. You didn't need to be a detective to see the pregnancy and barn result coming. I still really like the show, but they do need to fix the back and forth between Shane and Rick. I personally am not a fan of the guy that plays Rick. He does a spasm every time he wants to say a line with anger or passion.
There needs to be some depth to the characters. To me Dale has some as well as Darryl. You look at the ultimate character development show like Lost. When characters spoke you knew what they were about but the end of the dialogue was still in doubt and kept you interested in what was going to be said.
I do like the the mini flashbacks. I am not looking for them to do it like Lost, but a little back story could help them. Atleast its a filler that gives some pay-off to the viewer.