^ This. I think warriors in general need to be looked at. Most of them can't close gaps with any unit safely, let alone sustain themselves in battle.
The armour warriors wear isn't particularly potent, so the guard they gain [which benefits from armour, barrier doesn't as far as I'm aware] doesn't make up for the disparity between mages barrier and warriors armour/guard. I honestly think warriors [bar legionnaire] need more reliable and useful ways to gain guard, especially the Katari who doesn't really fit any role [low-ish damage, poor guard, no life steal.]
Edit: There's also the issue that enemy normal warriors can parry melee auto-attacks ad nauseum, putting warriors [especially reaver, who relies on damage to sustain] in a much weaker position than mages/rangers [rangers, if im not mistaken, don't tend to get their attacks blocked often and mages can't be blocked by most warrior types.
The "parrying ad nauseum" is something that is encountered by any melee class, and not all have usable workarounds. However, parrying does affect Archers and Hunters, because those parry attacks can block all 12 shots of Leaping Shot, a Long Shot, and even Full Draw. The first one of those three makes no sense.
Any class with a stun, knock down, or other CC can get around this. However, if playing the generally-used Reaver rampage build (War Horn/RoP, rampage, Devour, Dragon rage) all you can do is War Horn, and if you don't kill them the first time you hit them, they just start parrying again.
As with the AW and Reaver, those classes that rely on doing damage as a part of their defensive structure have a great concept, but oftentimes poor execution. The AW has enough utility and tankiness to make up for the fact that it is predominantly a melee cloth class, as well as having both a gap closer (PotA/Fade Step) and ranged attacks. Reaver has neither a gap closer or ranged attack.
TLDR: Melee have it rough. Playing melee survivably (besides the AW) requires some modicum of intelligence and forethought before each pull.
And yes, the Katari has the highest skill requirement for the lowest reward. I played with a good Katari today. A hybrid dps/tank build, I'm 90% certain he had To the Death, Charging Bull, MB, and something else. But he was the first one I ever played with where I didn't spend the entire time bubbling him on my keeper. I could actually look at someone else without worrying he was going to flop like a wet paper bag. Fix the Katari. The Qunari are engines of destruction. They don't deserve a gimped class.