I do, but if there's no one around and I just killed a guy or I happened to land the last kill of the match I'll put more rounds into the guy's corpse.
It's more a heat of the moment kind of thing than it is a "Yeah, **** you and the horse you rode in on." kind of thing. That and if it's annoying when the enemies in campaign do it I don't see it losing any of it's effectiveness in a multiplayer setting.
GT: SilentChaos87 - Currently Playing: League of Legends, Black Ops 2
If an enemy is still in front of me, or in the area around me (basically within my sights), I will attempt to take him out during the end screen. Usually I manage to do it, because he doesn't react at all. Sometimes they will shoot back or just get on the move.
IRON MAIDEN IS MY RELIGION! Gamertag: Demigod Elessar