Final Fantasy XIII
I've played many games I just didn't like. I have rarely played a game that I actually felt upset to even be playing. The worst of these was Final Fantasy XIII. I grew up on this series, and this just felt so awful. I loved the visuals, but all the characters were awful and unrelatable. The story was meh. The combat had been changed into some weird cinematic thing that I was better off letting the computer run. I didn't mind the Gambit system in FFXII. Why? I actually had to learn the combat, learn my enemies, and earn the abilities through actually playing the game. I felt like I was still doing my combat, but with a system I built to save me from pressing the button. In FFXIII, I just hit X/A over and over. That's it.
I just miss actual story development and character arcs that I actually cared about because I could relate to the character. I got that in some of the older titles, and got an amazing dose of it in Final Fantasy IX.
That, and they made the Adamantoise look more like a grazing elephant. I also miss when running into a Malboro was actually a really bad thing. Bad Breath from FFVII, anyone?