There's many terrible games out there. However, when it comes to games, I've mostly played older ones, so I can't list anything recent.
In no particular order, I'll randomly list games that I'll never touch again.
Rocky and Bullwinkle for the NES
Sure, it's based off the cartoon and all, but the gameplay was frustrating and seeing bombs and explosives everywhere after awhile starts to get kind of old. (unless you happen to like that sort of thing)
Barbie for the NES
Don't ask, I had the ROM and I was curious...oh, the atrocities! D: If you ever play this game, play frisbee with the cart!
Kirby's Dream Course for the SNES
Sure, I love Kirby to pieces, but mixing Kirby and golf, eh... I strongly dislike this game. (heck, I got the game for free from my brother, he didn't like it either) I just don't care much for sports games.
Final Fantasy: Mystic Quest for the SNES
I'll never understand why there's so many Final Fantasy fanboys. Series is overrated, and this game here is a great example of why Final Fantasy shouldn't have those...I think calling this a side game is appropriate. Anyways, I just didn't have fun with it while some other people did.
Breath of Fire II for the SNES
Games with strong religion in the storyline are a huge turn off for me. A great example of why simple games with hardly any storyline at all are
better.
Castlevania II for the NES
Where do I start? The whole being cursed and the random day/night system going was an annoyance more than anything. I loved Castlevania, (the first one) so this was a huge disappointment for me. To be blunt, this game just sucked.
I could keep going on and on with these, so I'll stop here and perhaps post more if anything comes to mind.