Telltale's The Walking Dead - 400 Days plays just like The Walking Dead. This isn't a bad thing, as 400 Days was a DLC for The Walking Dead. What Telltale has done was streamlining the adventure genre, by giving the player greater control over the character and minimal inventory. This was done in order to tell a greater story and The Walking Dead has that.
This leads me to the story of The Walking Dead - 400 Days, it plays across 5 different perspectives. For the character you only play snippet of the 400 Days. So here lies the problem, the 400 Days DLC can be see as an origin of the 5 characters and how they come to be. Sadly this DLC doesn't tell the second half of their tale. The tale of how they all met, and how they became a band of zombie survivors.