I've liked the game so far, however, I have a pet peeve: Zombies do not break doors down and simply "forget" about you as soon as you close a door in their face.
Also, I've gotten to the city part and damn.... difficulty ramps up! There are now consistent groups of 5 to 7 zombies to fight at a time, very different from the lone wanderers you usually find in the hotel and surrounding areas.