FF 14 takes the cake no doubt. I've been gaming since Wolfenstein and Doom. I have had plenty of upsets, but oh my god FF 14 was SHIT. Shit in every manner of being shit that is possible. They literally had to 100% remake the game and even call it FF14: A Realm Reborn the game was so fucking bad.
Brink was poop.
I didn't like the Risen/Gothic games either, but mainly because the load screen took 2 minutes and you CONSTANTLY had to reload. It would have been tolerable if not for the load times.
And if Borderlands was the worst game you have ever bought..... lucky you. I agree it is repetitive but it not on my bad games list by any stretch. If you don't like cel shaded why would you even buy it?