Map Classes

[an avid fan]

I am an owner of your Strategy Guide on Modern Warfare 2 and I was very confused on why the map classes are in the guide. Are they supposed to be used whenever I play on that map in general, or are they limited to just team deathmatch? If I only use the map classes for Team Deathmatch, then when should I use the Mysada class for Team Deathmatch? That is my only question, I will be grateful if someone could provide some insight on that.