Heres with the maths comes in.
Technically, your eyes are the 'most' limiting factor - they are 12.5ms on average.
The monitor is 8ms.
But it still benefits to have say 2ms, because whenever you see an image the monitor ensures it will be a more recent image.
However, to be strictly honest, your gaming skills, unless they are 'professional' level well.. its not going to have too much bearing.
ps3's run on 30fps, most experts consider 30 fps playable (borderline) and 50 fps good.
Your monitor allows for more than than that, and reflexes are much more limiting tbh.
Having a 2ms monitor leaves noone to blame bt yourself - having an 8ms monitor means you can rage at it more