For me this 'honor' goes to Lunar Dragon Song. I originally got this game from a friend in summer camp when HCBailly was playing the psp remake of the original lunar, so I thought this would be something like that. Instead what I got was the most tedious RPG I ever had the misfortune of playing.
Running drains your health, you can't select what to target in battle, you have to choose between gaining items or experience, every character besides the main character in battle is dead weight, and sidequests are all fetch quests which all rely on the enemy's random drops.
So yeah I had a bad time with it.