Simple Mosfet Shunt Regulator

I make a simulation of shunt regulator. Current output max. about 300mA. It tested by my friend. He compared with voltage regulator of LM317/337 with op-amp noise reduction and without. But he think, the shunt regulator sound better.

How can improve this design? Any though are welcome.
 

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  • Simple Shunt Regulator.png
    Simple Shunt Regulator.png
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