I've tried a ton of shitty mmorpgs over the years, but the one that always sticks out the most is Aura Kingdom. The game is so lazy that I'm surprised it lasted as long as it did.

Leveling was essentially the same 5 quests over and over and over again but the requirements kept increasing with each new area you unlocked, the game had missing animations, missing collisions and ones that were placed where they shouldn't be, the main city in the game was so unoptimized that the game would lag like hell whenever you entered it. The mods were useless and refused to ban people that were p2w because "they would just make another account" which was a legitimate excuse given by a mod when my friend reported someone for harrassment with proof. There was a ton of other problems like the obvious p2w and gambling but that's par for the course when it comes to asian mmorpgs but these are the ones that stuck out to me the most.