There are a lot of neat debuffs in the game, so much so that you can really build a party around them and crank out CC, DOT, or literally kill an entire team with a couple of stacks of another. However, if you’re thinking of pursuing anything but raw damage, you’re in for a disappointing experience considering that only 2 game modes - Campaign and Arena (maybe Guild War too) - allow debuffs. It’s worse considering that there’s a decent amount of PVE content to work through; Guild Rush, Guild Raid, 3 item (gear, accessory, gem) raids, 3 daily dungeons (gold, rank up material, gear), event dungeons (usually 3 at a time), Heavenly Stairs (not like classic “endless” tower at all), and there’s even a world boss type mode where you can’t use any of your character’s skills. You literally have abilities that improve the effectiveness of burn, bleed, poison, and increased damage against stunned and frozen enemies...but you can’t use any of this. Mind you, over 34 out of 44 of the end game “mythical awakened” characters have at least one debuff skill...that’s over 3/4 of these characters.
Maybe my memory fails me, but I seem to remember there was more content too, or perhaps it was reworked (which if that’s the case, it’s worse than before).
Honestly, the game is mediocre at best. You’ll get a lot of free boosts to get your account up to snuff with some of the long timers, but the content simply isn’t there...or if it is, it’s debuff immune.