I just played a Deathmatch/Elmination where my entire team died, and I was the only one left. The enemy team was honorable and 1v1'd me; however, even though I beat them all it didn't matter, as they would just revive the last person I killed. Fighting someone is challenging in itself, but to try to always land a heavy as the final blow to execute against skilled players isn't happening.
Deathmatch/Elimination should live by its name. If you die, you are eliminated. No revives.