For me, it was Skyrim. It was one of the first games I bought with my own money and certainly the first where I followed the news before the release. I did not know that Todd Howard was a notorious liar and that ruined the game for me. Like, the game itself was probably fine. It was an upgrade in some ways and a downgrade in various other ways. But having been promised that it would be so much better than Oblivion and Morrowind, when it was simply not, that just robbed me of the fun I could have had with it.