Hey, I am in that screenshot!

Whilst ping is one of the things I would personally limit (250 is what I have had on some servers, and it worked okay), I would rather just have it so you can ban people that you can see visually lagging. Like when it looks like someone is teleporting around the map, rather than running. It makes them extremely hard to hit, they never respond to chat, and end up facing walls most of the time. I think that should be an acceptable reason to kick them off the server. Just my thoughts though, either way I still pwn