I've noticed this a lot too. I understand quitting mid game/early game if things are messed up connection wise or even if you are having a bad game, however waiting until the end and then dashboarding? Dashboarding at all is stupid but to do it like this is even moreso.
i have a 1.97 KD with 53K + kills. I mainly play HC CTF. This happens A LOT. I usually always play with 2-3 players and when we come up against people with 2+ KD's, they almost always dashboard. So yes, most of the 2+ KD's are fake stats.
what I DO wish they would implement is a way to transfer the stats to your COD profile, even if you dashboard, they would upload as soon as you re-connected to the multiplayer server.
also, I hope the give us a record or stat area for Games Quit and Games Dashboarded that you could see on someone's profile in the next COD, similar to how gears of war 3 did it.