I should have clarified, I didn't mean that the information was useless or anything like it, just that they spent very little time on trying to figure out who the human culprit/culprits are. The last murders weren't even analyzed or even thought about.. and Battler's weakness was disappointing. The backstory and characterization was nice.
Bern's comment about the one sided game could just mean that the game was dominated by Beatrice. I will be a bit annoyed if it turns out that the situations are impossible to explain without magic at the end, I hope that is not the case, but I think the intro to the series that I linked earlier is pointing out that it is hard but possible.