I quit playing around 3 hours in. I found the story predictable and boring that far in. The "bitten person as a cure" is one of the oldest zombie story ideas there is. Also, I saw what happens to your starting character coming from a mile away. It was obvious with her not being the featured subject leading up to the game and in everything I saw about it.
The settings were drab for me too. I loved Uncharted 2's settings in comparison.
The one thing I do like/love is the details in the game. I spent like 20 minutes in the house at the beginning.