no its not needed, simple and if your gonna do it dont make it happen the exact same way, something from my design doc:

-enable gore effects randomly, meaning, out of every 20 headshots, only once may you actually see gore effects such as the head flying off, this way, the gore doesnt get old quick and inspires more awe moments.
-reduce gore to close ranged attacks, popping someones head off in closerange by a noscope snipershot is obviously more rewarding than doing it 50 meters away

gore doesnt make the GUNplay better, its just a reward...

anyways, just my 5cents

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