TWD started with so much promise: A zombie show that really gets in and explores the zombie apocalypse in depth the way the old Romero movies never did. The first season was really great, the standard "make your way to safety" story line propelled by fun characters, relatively logical decision making (by zombie movie standards), and an immersive world.
It was a really a slow decline into, as previously stated, melodrama since then without much direction or arc. I stopped watching after Neegan was introduced, it just felt like "The Governor, round 3". Basic supplies suddenly become an afterthought until they're needed to propel the plot, life saving riot gear is totally forgotten, people make out of character mistakes or decisions for the sake of drama, ugh... Clearly the writing team had no idea what they were doing next and really were just flying by the seat of their pants.
If I'm going to wishlist a bit, I would have liked to see the show follow a clear trajectory through the growth of a post apocalyptic civilization. Start with individuals, these individuals form groups, these groups form communities, these communities form societies. Zombies are ever present, but how culture and societal norms change now that the nature of death has changed could have been more fully explored.
I really think Rick/Carol should have filled the role of Neegan (both slowly becoming more ruthless, losing their "rules" to the stress of leadership, personal losses) vs Glen/Darryl who maintain (or gain) their humanity through the show. That should have been the crescendo of the human conflict.