Probably not the worst RPG I've ever played but certainly the one I was the most frustrated with: Bravely Default. I was infatuated with the idea of the game when it was first announced, especially the art. I told myself I would buy a 3DS specifically for this game if it was ever released in the west, which I did. And gosh, it was amazing. I still remember my breath taken away by the first town, in 3D, when the camera pans out to view the whole city. The music is great. The characters all are interesting and funny, and I'll back Edea and her "mrgrgr" all the way. The game even had voice acting! I didn't like the grind but auto-battle made that bearable and gave me, a casual player, the option to explore the many job classes.
Then I got to the time loop. Ho. Ly. Shit. I wanted to physically break the game. What was going on? Why was this happening? Was it some psychological experiment designed to test my own breaking point? And I swear that I did the thing to break the loop but IT DIDN'T WORK WHAT THE FUCK so I had to sit through the entire thing again and again and again and again. Granted, that's what the player is supposed to do anyway to get the true ending and experience all the side quests, but excuse me, I don't want to subject myself to that torture.
Completely ruined my experience of the game. Didn't even give Bravely Second a second thought because of it.
I did try the demo to Bravely Default II recently. But after seeing the in-game notice that "the demo is designed to be much more challenging than the actual game" and having my party members one-shotted by the first enemies I saw, I noped right out of that.
I feel I might turn on the original again someday just to re-experience the first joys I had with it, but I doubt I will ever put any actual effort into finishing the game ever again.