There is a noticeable delay between when you click to melee attack, the swing animation, and the actual attack.
Combined with the current hitboxes, movement system (clunky/twitchy "ArmA" style) and hit registration, this makes melee combat completely random against anything that is not immobile (and even then).
Equip a baseball bat or a shovel.
Try to attack someone circling you unpredictably.
Clunky melee and clunky movement combine to create an atrocious game play experience. The clunky movement is acceptable in ArmA because the movement is tactical, it has for objective to bring you to position A to B and give you options to use ranged weapons from that position.
It is not suited for the "quick-reaction, small-adjustment" twitchy type of movement we need to do to be able to engage in CQC melee combat. (see sword fighting videos for the movements needed)
I feel this awkward paradigm is also applied to the melee combat. We see non-fluid movements, and it feels like we're shooting a gun at the end of a lengthy animation, instead of swiping a shovel from right-to-left. All of this makes it rather painful, and if anything, random.
This is, of course, feedback, and not a bug per-say. But anyway, "standalone" should mean more then not having to buy ArmA 2 to play the DayZ mod, so I'm looking forward to see what you can do with this game.