Ever since the release of mod tools for Call of Duty: Black Ops, the ranking that gametracker provides has been skewed drastically. This is mainly due to the fact that individuals that are running unranked servers w/ mods are using fake bots as testing purposes / luring individuals.

http://www.gametracker.com/server_info/173.199.86.40:3074/
http://www.gametracker.com/server_info/195.122.134.186:3124/
http://www.gametracker.com/server_info/173.199.64.136:3114/
http://www.gametracker.com/server_info/66.55.150.92:3074/

How do you go from 8642nd to being ranked 58th in the matter of less than two weeks? You can't, plain and simple. I would ask that the developers of GT make adjustments to the system, so everyone has a fair and equal ranking.

The bots on that server are detected as you can see - they are not counted towards ranking. Since ranking is determined on a monthly basis, with more emphasis towards the recent week or so of activity, it is very possible to get to that rank in two weeks. This is how it has always been.