If you absolutely need a ping threshold, at least choose something sensible like 500 or 750, and make sure you use some sort of average.
People claiming they can differentiate between a 150 and a 200 ping remind me of people buying those "oxygen-free" audio cables because it sounds better if the electrons didn't make contact with oxygen on the way...
People claiming they can differentiate between a 150 and a 200 ping remind me of people buying those "oxygen-free" audio cables because it sounds better if the electrons didn't make contact with oxygen on the way...