Would you criticize Breaking Bad because you don't see as much crack being made in more recent episodes? How fucking stupid.
It's not stupid at all. The meth on Breaking Bad is not the plot, the plot is cancer-stricken man is pulled into the seedy world of illegal drugs and how he participates. The plot of Walking Dead is survival in a zombie world. If you aren't going to focus on conflicts with zombies then they should've just set it in a post-apocalyptic world sans zombies.
Zombie movies / shows are never about the zombies. They are about how the survivors navigate that world. They almost always play with the humanity aspects of it all. What does it take to be truly human? What happens when the zombies aren't the only bad guys? Etc... Most classic horror stories play with the line between human and monsters, and that is why the genre has survived as long as it has [ * ].
If you read the comics you will know that The Walking Dead is much more about the surviving humans, their interactions, and a discourse about society than it is about zombies.
It's not stupid at all. The meth on Breaking Bad is not the plot, the plot is cancer-stricken man is pulled into the seedy world of illegal drugs and how he participates. The plot of Walking Dead is survival in a zombie world. If you aren't going to focus on conflicts with zombies then they should've just set it in a post-apocalyptic world sans zombies.