I've seen this one a lot on the thread, but Shadows of Valentia.
I really wanted to like this game, but the gameplay ruined it for me. Some parts of it feel impossible to play through, and I felt myself getting more frustrated with the game than I was having fun with it. I didn't care too much for the characters either, only a handful of them I actually liked.
I was just really disappointed, since I was so excited going into this game only to be really let down. The art and soundtrack for the game is amazing though, I'll give it that!