jjsimp: Played the single player and seems fun. Tried on some of the higher levels and need to drop it down as is too difficult for my weak skills. Fun game though, I love killing zombies. Unfortunately there's one that spits acid at me that makes it more difficult.
Also, would have been nice to use the silent weapons like the sword, but the game is really hard that way. Not sure if the game is like TWD where if you use a gun they are drawn to you. Computer AI uses guns, so no way of testing that without going online.
All and All it is a great game since it was free.
Fairly sure it doesn't do anything like that and you can shoot some of the zombies/infected from far away with whatever weapon and the others won't start chasing you unless a boomer hits you or a horde. (or if you get too close to the zombies just standing around).
Also I love the sword :) only certain special infected makes it annoying to use melee weapons especially if your playing alone.