The classes I use are usually all the same. I four sniper classes and two assault classes.
Class One:
Primary Weapon: M16 with ACOG Scope and FMJ
Secondary Weapon: Spas-12 with Grip and FMJ
Claymore
Flashbang Grenades
Perk One: Bling Pro
Perk Two: Stopping Power Pro
Perk Three: Ninja Pro
Like I said, I have six classes all together and I pretty much use them all in one way or another normally. I have two classes with the Barrett .50 Cal, each has FMJ and one has Thermal and the other has Heartbeat Sensor. The other two have the Intervention with the same setup. I got my Prestige .50 Cal title so I'll probably end up moving one out so I can use the WA2000.
Each of my loadouts change depending on the match type though. Anybody worth their salt should do the same thing.
A1C Peck