http://en.wikipedia.org/wiki/The_Rescue_of_Princess_Blobette for the original Game Boy. I played thru it even though it was very bad, simply because it took me less than half a hour to do so. Very short game, which is also mainly why it's so bad, bit of a rip-off to pay full price for it

Still, that was 20 years ago. Can't say it happens nowdays as if I feel a game is bad I stop playing it. No point in wasting time with something that annoys me. That said, I am rather forgiving when it comes to gameplay and so on, most cases where I feel a game is bad it's because of the characters or because of the story, not the actual gameplay or graphics and so on.

Yeah, DQ9 was a bit of a letdown for me too. Took me about a year to finish it cause I kept taking breaks from it. DQ5 and DQ8 were both much more fun for me, even if they had some grinding too.