The worst issues of the game?
Everything in this game is a DPS race. Every instance has a time limit to clear (also the new Challenge Mode) so if you don’t deal enough damage you’re basically out unless you’re an uber supporter (e.g. Thauma/Chrono). Many utilities aren’t required to play the game at all, or are so badly designed that it hurts (e.g. Kabbalist debuffs).
The main issue is that there is no real balance between the Classes even within a Class tree, leaving aside between Class trees. You can take Class A at Rank X or Class B, but if Class B is 3 times worse than Class A because its damage&utility is useless for any game content, why would you choose Class B in the first place?
It’s just aweful to see some Classes performing badly and the developers completely ignoring them (e.g. Kabbalist/Oracle), throwing some random changes at them and say they’re balanced, while buffing lower-Ranked Classes to be several times stronger&more useful than them[e.g. Bokor/Krivis].
What the heck?
It’s good that low-Ranked Classes become viable choices for higher Ranks, but they shouldn’t outright outperform their higher-Ranked counterparts.
Where is the balance here? It’s just roles reversed, underdog becoming top-tier and so-so performing Class becoming a total underdog.
I can’t refer to it enough, the developers have made 2 statements about their rebalances [look them up on the developers blog on the homepage here and here ] and with their achieved “balance” they worked exactly against what they stated in these two posts.
I don’t know what exactly they’re trying to achieve, but it certainly looks like Class-biased balancing, similar to what Eyedentity did with Dragon Nest until the players started to run away in large numbers due to their meta/viability changes every level cap patch[ which in turn made people buy a Class Change voucher and play the other Class Branch to stay viable] until the level 93 renewal patch(for those not familiar with how the game progressed: lvl 24 cap>level 32 cap>level 40 cap>level 50 cap> level 60 cap> level 70 cap> level 80 cap> level 90 cap > level 93 cap with ever-changing meta for ± every cap where 1 Class tree went into the trash bin for being useless while the other one became super-useful).