I bailed on the show after season 1 and missed season 2 entirely. I just got back into it this season (3). To me, the show is something to watch until Breaking Bad and/or Mad Men returns. The acting and wrting of the two are light years ahead of "Dead".
There is a certain sameness about zombie attacks that gets old rather quickly. The show would be better with maybe fewer actual attacks replaced by a better build up of suspense before the atttack. Also, similar to Lost, I don't care about the main characters. I just don't think the actors are good enough to make their characters interesting enough.
Less blood and grime, more suspense.