ARMA and L4d2 clearly don't, STALKER I wouldn't know about.
S.T.A.L.K.E.R. ranking ranks you against the AI. As you kill specific AI, ranking goes up. Its a large background mission, as you need to hunt down... a lot... of other S.T.A.L.K.E.R.s, Military personnel, duty, freedom, and Monolith soldiers. Its multiplayer also utilizes another ranking system to an extent, but its unplayable from the US as every server is from Ukrainian/Russian PCs, so its more often than not, a full second latency if you're even able to connect.