I actually lump the Walking Dead with shows like Revolution, in that they are very entertaining (well, except when they are occasionally sort of boring) but they don't exactly have brilliant writing. I've always found WD to be stylish and to have interesting characters, but the words actually coming out of their mouths and the plot arcs can leave something to be desired. I thought the same thing of LOST and Orphan Black seems to be shaping up that way as well. There's a whole other kind of show that I'd say is truly great and can transcend being just a solid, reasonably well-crafted series like Game of Thrones, Battlestar Galactica and Breaking Bad.