As a nb PvP main, completely can’t relate. Cloak is great, if you don’t entirely rely on it to survive, e.g. spamming every second or staying in cloak for more than a few seconds. It gives you 1 GCD of reposition with nullifying all projectiles coming at you, plus gives you 300 weapon damage (vampire’s strike from shadow passive) plus gives you major savagery on both bars. Some other classes have to slot Camouflaged Hunter or Inner Light just to have this one passive on ONE bar.
I think this skill is packed with goodies and if you think “it’s not viable in PvP”, that’s definitely a skill issue.