I'd have to say up close and personal for me, knife/spade/punch. I wish i could choke a player to death with my bare hands and watch the life fade from his eyes.
Flanking the bridge on KAlt and knifing/shoveling both the sniper and the MG. Also nading anyone prone in the sewers, in the wheelhouse (eh-hem Ish) or camping above a ladder (eh-hem Ish again).
My favorite way to kill a man is probably when they least expect it. For example i like to wait on top of the wheel in Kalt and wait for the prey to come and when they run for my teams sewers i usually either follow them and stab them or follow them to see how long it takes them to realize i am behind them. Another of my favorite is throwing nades on the bridge on Kalt and killing quite a few guys on there.
haha thats funny, i like to kill people who follow my teammates.
lol suicide nades usually fail
Clearly the best way to kill an enemy is by a punch. I mean how unrealistic is that? Obviously knockouts can happen in real life with punches, but it is pretty tough to kill some one with them, especially with the two or three it takes in-game. In any case, I think it is pretty sweet. Nothing like filling up the kill list with something like 6 successive punches.
Headshots with the SMGs or Support rifles.
*Ping* and the guy hits the ground. With the Snipers the headshots are kinda meh, they happen all the time, but spraying a guy in the head with my Thompson...Oooh yeeee.