IMO they need a deep revamp to the polearm tree (and possibly AA tree too) with pvp in mind (not gonna happen, I know ). The class is just lacking in depth and mechanics. When frenzy had a magic damage modifier Guard was undeniably OP - not because of CW but because of SS* + reckoning which could one shot (or at least nearly one shot) any clothie - and reliably at that. On such a tanky and simple class (with passive CC resists) high damage is OP. Brute Conq might be a cheesy class but at least they have some stuff to think about - debuff your target and get your crit stacks up before landing FA 9, for example (and maybe even apply a quick GodS). No such thing on guard. Just go frenzy and prey that your CW crits. And before the frenzy change you simply went frenzy and did SS + reckoning (which is very fast) and you instantly had a kill.
*also worth noting that SS does electrical damage (which is why it was affected by the frenzy modifier in the first place) and back then more than half the classes were running in pve gear with very low protection due to how bad pvp gear was.
Oh and did I mention that passive CC resists is a boring and stupid mechanic?