As a GM, I use v2.2 just because that's what the GM in my first T2K game (as a player used). I don't find it too deadly to PCs at all. I ran a PbP campaign for six years, real time. Most, if not all, of the PCs in my game got hit at least once, some by bullets, others by shrapnel (a few by both). Only two or three (out of at least two dozen) were killed by legit, non-fudged die rolls. Kevlar body armor is a real life saver- torso and head shots had little chance of killing a PC. It takes a very unlucky series of rolls to do so. I had one player who's PC survived at least three different head shots (5.45mm and 7.62x39mm) thanks to a Kevlar helmet (in different engagements of course). It got to the point where I was having a hard time figuring out ways to accurately describe roll results in a convincing and varied manner. Suffice to say, I had to add in some concussive effect injuries to help suspend disbelief.
With v2.2's quick kill rules, combat can be deadly to NPCs, but those rules are optional, and you can choose to use or omit them when calculating damage for either PCs or NPCs (or both).
I can't speak to the other systems. I played in a v1.0 PbP and it seemed deadlier than v2.2 (the GM posted all die results). I have no personal experience with 2013.
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