Disregarding the absolutely unplayable and broken, I think it's a toss up between the 2008 Alone in the Dark or Final Fantasy 15. I'm more inclined towards the latter because I haven't played the former since release. It's just a godawful RPG, if you can even call it that, the game basically plays itself, has no depth whatsoever, the open-world is meaningless and empty of anything interesting. Not to mention the story is both dogshit and a confusing mess nonsensically split between different DLCs, movies and god knows what else. Definitely the worst big budget RPG (again, if you can even call it that) I've played so far, it's borderline insulting. The worst of it all? It was my first Final Fantasy and it was so bad it killed any interest I had in the series.