Everything that happens after the Dahlia murders in L.A. Noire is complete garbage.
And I just played through Prince of Persia: The Forgotten Sands and that one falls into the "GAME'S OVER, GOOD NIGHT, HOPE YOU ENJOYED IT" type of sudden ending (Sniper: Ghost Warrior, Kane and Lynch, etc.), though it has an added, completely unnecessary post-credits narration that doesn't actually tell you anything. But that's fine, dumb (but fun) games are allowed to have dumb endings, I don't mind. It's games that start really strong and then just fall apart (L.A. Noire, Max Payne 3 comes close) that irk me. So disappointing!