Though the worst murder mystery I've seen in anime I disliked greatly for one reason.
It was Detective School Q and basically...
One twin attempted to kill the other when the second twin ended up killing her in self-defense. She then created an elaborate murder trick to make it seem like her twin sister was killed by an unknown person who jumped through the window (or something like that)
The part I hate about that is: It was self-defense... Even if you consider that MAYBE she didn't think anyone would believe her, the police still treated it like a murder even after they found out what actually happened...
Are the Self-defense laws in Japan that limited? I mean even in Canada you can kill someone in self-defense (though goodness actually pulling that defense off is tough. Honestly because I am 6'4'' I can't use lethal force against anyone shorter then I am... though I am highly sure I am wrong.)
Don't get me wrong, I just like complaining because it is fun. I generally don't spend as much time complaining about things I hate as much as I complain about things I love.
As for the TVtropes page of Viewers are Geniuses... the general standards seem rather stable in that about 1/3rd of the examples are either "Genius bonus" or are examples that are true if you happen to be quite unknowledgable (such as not knowing the Greek or Roman Pantheon). For example they reference Persona 4 as this because of the quizes they give you... Ignoring that it is trivia a lot of them are actually straight basic questions and I REFUSE to believe the average intelligence of a person is so low that knowing what a Dirrect and indirrect article is with multiple choice is apperantly too far to grasp. No I simply cannot be that smart.