Is la noire a fun game

All games, taking the label it has been given, are meant to be fun. If you find a game frustrating, then it is either fun and challenging or not fun. If you take the game seriously and treat it like it is real life, then you will most definitely not have any fun at all. If the game is none of the above and still not fun, then it is simply boring and you should stop playing it or choose another game.