I agree here, I loved Grandia 1 and 2 so really was looking forward to 3.  I ended up really disliking that game afterwards.  I also would say Beyond the Beyond on PS1 was a pretty horrible experience of an RPG.  

I somehow got my hands on Deadly Towers for the Nes. I tried to like that game but it was just horrible. I didn't really know the difference between good and bad games at the time. This game changed that.

FFVIII

Nothing makes sense, not the story, not the gameplay, nothing. Even worse, the new mechanics that doesn't make sense only makes the gameplay more unnessecarily convoluted and lame, so the things that were introduced that doesn't make sense cannot be justified by the gameplay either.

I suspect many people who like this game only do so because of the psychological effects of it being a sequel to FFVII. Everything about it is broken.

This , its one of the worst games I've ever played.

I really haven't had a bad RPG. I know, its kind of surprising, as there are a lot out there, but I only buy the ones I think I would like.

You poor bastard. I know your pain. I was just a kid and I thought the box art was cool.

dark souls/demon souls for me. It's pretty bad. all people ever talk about with the game is that it is tough and unforgiving, but really its not that hard.
the problem with the game was it was incredibly boring. the boss fights were great but it was a pain to get there. killing trash mob after trash mob.

players being able to invade your world and kill you would have been ok if it was balanced. PVP pures ruined that experience as well.
I stopped playing both games after the 2nd/3rd bosses I killed because I couldn't do it. I dreaded the slow agonizing movement to the next area and next boss, however, the boss fights were pretty epic for what it's worth.

I was fortunate enough to never play this game, though I did play a lot of stinkers on the NES, at least most of them were ones that my friends owned. My brother and I only got about 3-4 games for our NES a year, since we had to buy them ourselves. It took us a long time to save up for them.

As for the amount of people who say FF XIII is their worst RPG experience, that really surprised me. I also did not like FF XIII, the game is visually linier, they could have at least hidden how lineir it was by making the road curve a little. And the story was uninteresting and convoluted, at least up to the point I stopped playing 10 hours in. But the combat system was really good and the art design wasn't bad. So the question I have, is it that you haven't played very many bad RPGs, or was it that this game so undelivered to the hype that was built up that it caused the game to be your worst RPG experience?

The worst RPG experience was The Elder Scrolls IV : Oblivion. It stands out from the other games, even Atelier Rorona  which I didn't like that much.