I'm sure I'm alone in this, but I actually found the season 2 premiere (set on the highway) to be a lot more suspenseful.
I suppose there's just something about the threat
of a zombie attack I find to be a lot more exciting than the actual killing of them.
Here, it was basically just a nonstop parade of zombie killing from the start, which made the whole episode feel a bit cold and mechanical to me, like I was watching characters in a videogame or something.
It wasn't until the end, when Herschel got chomped, that I really found myself glued to the screen.