This is why the term is so rare on warmane because to many it is unheard of, like twinking here.
If it’s TL;DR for you, don’t bother reading it, I am someone who likes to detail a subject. (The hp guy I mention had been address by a dev stating that it IS part of the game and the fact the HP druid is a Tank.)
Glass Canon PVPers have been around since vanilla days of retail WOW, and been around the day Kear Wolf founded Molten, onward into Warmane. They’re built to dish out the maximum damage possible, slightly above average geared players, get more ticks from dots in and or becoming an unstoppable force that cannot die easily/heal extremely well. So basically Glass Canons and twinks share some similarities, and in Warmane those who become GC for whatever reason do it out of twink mentality.
The only down side of this is the trade up of power/defenses. You become weaker damage received wise(unless you are a tank). This is where the word squishy comes in, you can do a lot of damage/heals or even takes strong hits, but you will get crit done against you quite often. In MOP, you will lose some resilience and or PVP Power as a result.
Glass Canons make use of not only trinkets, but some of the highest PVE gear possible to increase a specific stat. The re-forging/enchanting is only secondary when it comes to gear, which is the bread and butter. When it comes to gems they use a primary only (example agi only, str, only, for they don’t have much of a need for pvp power in armor, expect weps). As long as a 45%-53% avg. PVP power is maintain, they should be alright. The goal is to maintain 50 pvp items/50 pve items or a little of either.
GCs can do slightly above dmg that of a fully prideful player, but lacks defense. So the guy claiming that GC is not an exploit, just another way of playing the game. GC will have their presence again on retail once the final expansion raid is released. I will say this again, GCs can EASILY be dealt with because they have no defenses what so ever.
In warmane itself, there is only a HANDFUL of GCs, however, they stick more to their PVE communities. The reason they’re so rare is due to only a few achieving said gear, while others fall short and must only stick to pvp items and the minor pve items they can get a hold of. This is also the reason why many want to pve, for trinks and other items. GCs are extremely common among low lvl BGs/Arenas such as 70-74s and 85-89s, they hit hard, but cannot take a hit themselves easily aka Twinks (Twink mentality of being strong). So in a sense a GC in 90s is basically a lvl 90 twink if done right.
There is a few known GCs such as Ghostybrewz (agi/dps), Drgaga (HP), Dreadstroke MM/BM hunt (semi agi/dps), and Mdmaa (agi/dps). That is only to name a few out of a handful of them. Those geared with pvp items on the side and some still gearing to get more out of their class/spec.
Now you say something about exploit. There are people who Weapon-Stack, hence the abnormal amounts of damage. These guys are exploiting on Warmane and Game Masters are aware of this. This also goes with those who are able to instantly kill you with a single Arcane Shot that can crit you for practically 30mil damage in 1 shot. There was an instance in the past where a single pandaren horde hunter wiped out 36 Alliance players standing in front of TOT raid entrance. These are the types of people who ruin the game. Warmane also addressed a bug that took place a while back and to this day some people still get this bug randomly, giving them god mode like stats. Judging by your screenshots, that is nothing compared to what I have and a few others have experienced.