Agreed, but I don't really see that happening here. Even if Lori is acting a bit strange and conflicted, it's just one character. I don't really see her behavior affecting the story as a WHOLE in any way.
My gripes are generally very small with this show. I guess because the acting and writing has been so incredibly strong thus far my expectations are very high on the writing and the people who act out the parts.
Lori's behavior IMO didn't fit the circumstances and their explanation of it was odd on the Talking Dead immediately after the show.