Nothing is absolute
I have seen overly min/maxed 40s get effected by on-hit props, as well as one particular endgame boss.
This server has an amazing reworking of nearly everything possible to make it less OP and less gimmicky, like fail on a 1, and dev-crit those just HAD to go.
Pre-wipe KD was pretty powerful as many many people underestimated the importance of skills, these days KD is just hilarious when it works but can happen again due to min/maxing, ie; pure casters have some advantages but need to invest in feats and proper set of gear to avoid dying on their knees/backs.
Pre-wipe DEX-based melee was king, but no more for the most part - the thing with 2H in pvp, sure their AC is low but in many cases they can do 200-300 dmg in 1 hit, so except from ranged attackers, they aren't going to be too concerned about mosquitoes poking at them, also many invest in DR feats/classes to shrug off damage. But this does lead to severe weaknesses.
Bottom line tl;dr: The server/module has been painstakenly crafted by talented devs to (mostly) balance PvP, forcing people to find stronger 'i win buttons' and others to find the counters to those buttons. In it's maturity, ns4 has become a 3D version of a card game, especially in group vs group pvp (ie: picking builds to counter others).