Here is where Telltale Games and their TWD game come into play. Mindlessly gunning downs waves of the undead can be amusing, but a standalone game revolving around zombies should be more than that. In my opinion, more developers should follow in Telltale's footsteps and use the zombies as a narrative device, rather than just arbitrary obstacles or enemy. The zombie apocalypse is about people who would normally never interact with each other being forced into situations where they must depend on one another. There's also the emotional impact of seeing people the characters', and even the player, once knew being turned into an undead horror and the need to put them down. This leaves so many possibilities for character development that I'm surprised Telltale has been the only developer, to my knowledge, that actually utilized that.