the bigger threat than the un-dead. I think that's been a major part of the story from the beginning. I think that's actually a great way to go. Walkers are cool and all, but the "people vs. people" storyline seems more interesting to me, and it has more potential for longevity — walkers have no depth of character; they can only do so much.
For me though, this show has just always been kind of boring. I liked the first few seasons — they were good enough to keep going — but then it seemed to get worse and worse.
And re: the dangerous humans - I like that they focused on bad people, instead of just bad zombies, but they created villains (like that one "mayor" guy with the eye patch) that just weren't that interesting to me.