Haven't tried the game yet but the character creation screen already has me worried for a few reasons:
1. Very limiting race/class combinations: I probably shouldn't be complaining about this as a fan of Echo of Soul, but if you're going to let multiple races choose from multiple classes, do it all the way. Especially don't make two classes exclusive to the race that's obviously going to be the most divisive among players.
2. Class difficulty ratings: This is why I tend to avoid "action" MMORPGs, I feel like the idea of making certain classes harder to play than others just diminishes the freedom and social nature of the genre. MMORPGs were never meant to be for "hardcore" gamers, and while I welcome more variety in the genre, there's just too much of this shift and not enough casual MMOs out there anymore.
3. Seems to use similar armor system as TERA: Personal preference more than my other complaints, but finding new loot to decorate your character with is one of my favorite parts of MMOs. I feel like the Tier System for armor appearance makes grinding far more boring.