Pros:

+ Great idea

+ This should be one of Valve's Mutation you should send it to them

+ New spin on Realism I've never experienced before.
 + Forces teams to stay close to survive.
 + Gives Special Infected more advantages to kill you.
 + Very realistic.
 + Darkness makes you constantly look over your shoulder at every Infected sound.
 + Witches are harder to spot, so you must be careful.
 + Throwables and melee weapons have no more "crosshairs".

Cons:

None that i saw :D

Conclusion:

This is a great Mutation you should send it to them 


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