I think there is a bit of exaggeration and misremembering going on.
I'll be as honest and objective as possible but last season wasn't as bad as some of you are making it sound. It certainly wasn't nearly as good as it could have been so I think that's what is sticking in people's craw. And I agree with that.
I would have given the season a B overall. B- if I want to be harsh. Y'all make it sound like a D. It definitely didn't capitalize on all the things it had but now that we're in the payoff stretch I hope they go ham.
The last season was pure dogshit and had some of the worst writing and pacing of any current tv show. You seem to apply a very uncritical eye to this show. Just because its about zombies doesn't mean it can't have good writing.