Fun fact: They actually even tried this with the original Perfect Dark, using the Gameboy Camera:

"In addition to its other merits, the game was one of the few that made use of the N64 Transfer Pak. It was originally meant to have been used to connect to the Game Boy Camera and let players map real faces on to characters in multiplayer mode."

I, however, think it's a stupid idea.

...Oh, and all this is pretty much possible with Face Raider on the 3DS :P

I think it would be great fun for competitive online games, if done well.

I'm pretty sure a Tony Hawk game did this....or was a Tiger Woods game.....hmm but yeah its been experimented with

TV Superstars demo for move does this. It did it's job in having us laugh uncontrollably at the screen for 5 minutes then never touched it again.

How would that make the game personal or more emotional. I guess you could slap face on a person on the receiving end during a sex scene