I don't understand why ben_pokemon is being attacked so much. In a sense, I agree with what he's saying. Hyouka's main strengths for me are its gorgeous visuals and the relationship between Chitanda and Oreki. I think the mysteries are there to drive character relationships forward, and in that sense I think KyoAni have done a great job, and I don't think they need to become more complicated until they become the main focus of the show.
I will say, though, that I think the first two episodes have been overrated a little, because it's had a bit of a slow start and nothing terribly exciting has happened yet. I can't blame it for that because it feels like the type of anime that draws you in slowly, but the point is that I don't know how it'll turn out in the future, so I can only judge it on the content of the first two episodes right now.