Dark Knight has always been a weird tank for me, I love it's design I like big swords, but the job feels really messy to play for me, Some people enjoy it and that's fine.

I think my personal issues:
is the lack of a fun rotation, 1, 2, 3 90% of the time intense weaving 10% of the time, I more like a consistent rotation with some weaving in between, drks rotation feels like a mess
no "dark magic" attacks (exluding unmend and aoe?), I get Paladin does this (with its holy spells and blade spells) but i feel like dark magic would really fit dark, you don't have to copy and paste paladin lmao, but I'd like to see some sort of magic attack on drk
Defensives are good but messy, Drk has a lot of defensives TBN, Is good but i feel like its worse then the others and can be a dps loss, others short cds are free to use, I'd say the barrier is better and in cases where you stack defensives thats pretty good, but i feel like other abilites such as Blood Whetting do way more for no risk, Dark mind is good... in magic only, Oblation feels like bloat but its decent.

I don't know Dark Knights look is so cool, I really like the look just playing it feels bad for me, I'd only pick it over Warrior out of the 4 tanks because I don't find war fun while i find PLD/GNB hit the more fun rotation spot with good defensives that feel unique, I wish dark got more attention but it feels like it was just given big numbers this expansion so everyone would be happy.