The assassinations from Halo Reach are the way to go in multiplayer games.
>exist purely to style on people
>have ground to ground, air to air, air to ground, etc. variations
>very short
>actually kill when the knife connects instead of when the animation ends
>both people can be killed out of it
>can choose not to do them by tapping the key instead of holding it, and the punch will still kill the guy
The other good one was Titanfall 2, because getting a Titan on Titan execution gave you a second to catch your breath and look around you with the third person camera.