Too true. So many zombie games they put out have shallow plots a 12-year-old could write on Ambien.
Have you tried "The Last of Us" though?
Very well-done, story-driven zombie/post apocalyptic game that came out kinda recently. It pretty much lived up to the hype, though the controller scheme is a little... unfavourable. But then again, you come to expect that from Naughty Dog, if it isn't Crash or Jak.
And then there's that The Walking Dead game too, but I've never played it so I can't really give it a thumbs up or down.