I didn't watch a mystery anime since Hyouka, and god knows for how many years before that, so Rokka was a bit new. It leaves an impression of an Agatha Cristie novel, only moefied by the Japanese, as well as made flashy for a teen audience. The solution to the mystery is of a dubious quality: the explanation makes sense, but how they arrived to it insults the viewer's intelligence. And that is even complately separate from the ending, which is OreTata and a riot of hilarity. Too bad that the whole thing is spoilerable.
Liked: Kinda, despite all the stupidity.
Rewatch: Naah, it's a dalliance.