Another mediocre, derivative WoW clone
As is par for Korean MMO's, this game is a microtransaction fest that offers nothing new to the MMORPG genre, and actually manages to lack basic features that were in WoW back in 2004.
This is your basic class based RPG where you level a character from 1 to 50 by using skills to kill enemies to finish quests. The combat feels identical to WoW, with skills ripped straight from WoW, except the skills are a little more sluggish in this game with a pause after each cast is finished. The questing is the tired old "go here do this" with absolutely no innovation. The crafting professions are incredibly bland, offering the most obvious profession choices (alchemist, cook, blacksmith, tailor) and craftable items (healing potions, equipment, cooked food) and nothing else. The level ups grant you skill points and stat points which should offer customization options, except that the choices are blatantly obvious (always pump your main stat, always buff your dps skills while leveling, etc)
This game isn't even polished. Quest givers stop talking to you after you accept a quest or turn one in, so if you have multiple quests to handle with one individual, you have to keep initiating new conversations. If you have two stacks of identical healing potions, and you have a "drink potion" button on your skillbar, the button will only recognize one of your potion stacks and stop working when that stack runs out. The translations to English are so bad they make no sense 1/4th of the time, which is actually quite hilarious.
As for the microtransactions? I didn't dig too far into the cash store, but considering you have to pay real money to be able to respec your character's stats and skills, and real money in order to keep some of your items from decaying away, they're pretty blatantly required to be purchased in order to play the game seriously.
I've never played another Ragnarok game, so I don't know if this type of gameplay is standard for the franchise or not. Either way, it's disappointing that yet another well-known IP has been wasted on game mechanics that have already been done far better in another game.