bad ping
Imagine having to shoot someone with your wep, but he can teleport to a random location, randomly.
As an Offense Class Main, it's really hard to hit people when they teleport.
People can escape meatshots, rockets, and even flames if you have bad ping.
I consider bad ping, any value higher than 85ms.
My ping sweetspot is around 60, simply because I am not used to lower ping, and higher ping = bad.