3rd party ping tools shouldn't be allowed...
While the playerbase is rather large, over time its inevitable that you will run into the same players at one point or another, sometimes(depending on rank) 4-5 times in one day! However, some 3rd party ping tools will even tell you the IP address of the host you are currently connected to and "block" that IP meaning when they seek another match, they will NEVER connect to a blocked IP address.
Now this CAN BE a good thing but for every 10 people who use this to avoid bad pings, there are 100 people who use it to avoid that killer who owned everytime they played against them or some other dumb reason.
The devs need to implement something that detects these pieces of software when ran at the same time as their game and issue some kind of warning/punishment for those who use them.