I agree that this last episode was a bit slow moving, and even feeling pointless at times... but looking back, you need to throw an episode in like that once in a while. It's the only way to segue into moving forward from being stuck at the farm and maybe open up some character changes.
For example... a change in Rick. His talk with Hershell about giving up hope and then shooting down those two guys. I think that whole scene will open up a new possibility for Rick's character to become a bit more "bad-ass" and Shane-like. He knows his ways, although well intentioned, haven't been working and this episode is his realization of that.
Things are about to get GOOD.