Hiya Myhthos here~
Classes in Iris have always been "called" unbalanced. Maybe i can shed some light on a few things?
. Crusader. An undergeared crus isn't that great. But properly carded, properly used and understood one is a force to be fought against. Crusaders have, many imbomilzation bleeds and silence skills. they also counter healers as they have - heal % skills. They can now use DOT on bosses. If you are trying to solo with a crus? Make sure you know your limits. They aren't meant for the instant death against dungeons. but in a team they are great. They have high damage, high ITD (with one class surpassing them) and can easily kill enemies. They aren't the best at PVP anymore but in FM they are great due to DOTs stuns and over all being a pest to flaggers. They have MORE than their fair share of uses.
Every class here in iris will seem unbalanced when compared to a different class. That's because each class plays VERY differently. How to properly play a class? That's up to you to find, not everyone plays the same character the same way. and in the end it's up to you to understand how to properly build your characters and play your class in a way to suites your play style. Any character can be good, There is no "imbalance" unless you make it as such.
Oh and before you ask if i tried playing the crusader class. Yes i have~ When the class was patched to get rid of their 4 shot kill pvp potential i went about making one and acted like a standard player instead of a GM and joined in with a raid to do Lisk insane (which is now lisk hard)
The results? WIthout Gm style stuff, using only CQ, standard wings and stats V, the crusader never died in lisk I, i picked my time and struck wisely and lisk and rhinestone were taken down by the raid with me actively attacking. So crusaders are apparently useable~
As sedy said above. unlock your character slots, Card your gear with something to make it workable. Might i suggest Bear cards or stats? If you went pure stam you won't have the power needed. Bear cards give power and stam. Tiger cards also would be usable. they give stamina and agility which effects hit. power and stamina. Using standard inchant cards will help with getting you livable. if you find it still underwelming there is special ones that gives damage abs to chest. HP to leggings. attack or movement speed to feet, Str, stam or agi to helm and crit/evasion to gloves (crit is needed more for your class) plenty of players can make and sale you those. so keep an eye out in auction house~
Also remember potions and food effects as they are very useful as well.
If you want a FURTHER indepth on other classes ask me i'll give you my person opinions on them~