The general idea is pretty good, however, cards are just incredibly bland, all they do is give flat stats, they're unoriginal and uninspired now.
Combat is pretty shallow, but so was RO1's combat, and so is pretty much any MMO's combat nowadays, so that's okay I guess.
Quests are basic. Pretty much what you'd expect from an RPG.
Crafting system is decent, although I haven't used it too much. I like the idea of getting good gear for your own character, outside of dungeons.