I enjoy both Game of Thrones and The Walking Dead, GoT more so. But I'm not sure why people are comparing the two. They are nothing alike. One is about medieval fantasy and the other dramatic zombies.
I'm sure fans of The Walking dead realize the show isn't perfect, no show is, but some more than others. Yeah sure the writing could be better, it could be more "realistic", more gritty. There are things about a show everyone has an opinion on that it could be different or better. I enjoy The Walking Dead simply because I like the zombie genre.
A taste in a show is purely subjective and for that reason one can't be right nor wrong. There shouldn't be a debate about the two.
If you like GoT, cool. If you like TWD, cool. Go talk about it in their respective threads.