Guild Wars 2

If a player fails to land a Backstab or another attack from stealth because their target successfully negated the attack through either a Block, Blind or Dodge roll the player that missed their attack should have the revealed debuff applied to them.

Attacking from Stealth already gives a Thief a huge advantage, landing a Backstab is also not that difficult when the target area is a 180° area behind the player, the whole rear half.

GW2 has more ways to gain stealth in combat for the Thief than any Rogue archtype I’ve ever seen in any MMO released over the last 10 years.

In WvW the issue is even more extreme due to the longer stealth durations, shorter revealed debuff and greatly increased potential damage.

Right now the Thief has several advantages in attacking and also some of the quickest ways to get away from combat and out of a losing fight.
It is not balanced for a single profession or build to have the advantages in both opening a fight and safely disengaging.

The fact that a Thief in PvP can spam backstabs to clear any blinds or blocks while safely remaining in stealth to keep trying until they manage to land one is absurd.