I found the first 2 or 3 seasons to be incredibly boring and usually kept it on as background noise while I did homework. The only time my attention was grabbed was way later in the season when the mains started to have some character development. Then right when their characters stopped bring boring they were killed off. It makes it seems that who ever is in charge of this show; makes the audience reinvest every 6 or so episodes, which really makes you stop caring about any of the characters or their development.
I would recommend getting actors that are truly committed to seeing this show end, but instead, they asked to be killed off to pursue other projects. This show will forever be in the shadow of the original series, The Walking Dead. When it had so many opportunities to actually be something better.