Since BB is gone, TWD is the new can't miss show...but that even annoys me at times and I won't go into convulsions if I miss an episode.
I sure hope a new good show comes along soon, because I don't see a lot out there that really is can't miss.
Walking Dead is a very basic show, there is not alot of subtlety and beneath the surface stuff going on there, the reason it is so popular is it because it appeals to a very base aspect of human nature, violence. The violence and gore is literally the only reason the show is so popular, and perhaps the novelty of the fact that there isn't another zombie-based show on television. There is no intricacy in the storylines, most of it is very predictable.
I still enjoy the show but it is nowhere near a show like Breaking Bad and it honestly sickens me that the ratings it gets far surpass that of shows like Breaking Bad and Mad Men. It speaks to the nature of the society that we live in.
With that said, my favorite show right now has to be GoT or The Americans.