Y'all are treating this like one of your cheezy porn movies - fuck the plot, gimme a money shot/zombie rampage. That's fine for porn. But this is not porn - so character development is a good thing.
Y'all are too short sighted. Not to mention shallow as Terapin Creek. The writers know where this is going, and if you read the graphic novels on which this is based, you can get a good idea. And it rocks.
Merle is gonna come back for realz - bank on it. Daryl is gonna have to choose. And the farm is gonna be in the distance pretty soon. The point is to create a false sense of security and "normalness" but Shane blowing up the zombies in the barn is the first step towards shattering that illusion. The two Philly guys are the next nail in the "so much for normalcy" coffin. If you saw the preview for next week, those bad guys have friends, and they had to come from somewhere...
And yeah, Shane saves Lori - that was on the website. That will either create the rift between Lori and Rick that someone said it might, or it will send Shane deeper down the "Lori should be fine, to hell with Rick" thought pattern. That's what I think will happen, because that is how the original story tracks. If so, awesome.