Ping is just how long it takes a message to get from your Mac to the server, if you are playing with your next door neighbour you can have super low ping if you are playing in Australia and your opponent is in north east Canada your ping will be in the 100s if not much higher.
I have played games like Quake and Unreal Tournament on modems back in the late 90s with pings over 500! You just learn how to deal with it
Edwin