I have finished Hyouka, here are my thoughts about it:
Progression:
It had a lukewarm start that did not really pull me in, later on the school festival arc started and I loved it through and through. It had a good feel about it and it was the closest the series got to an actual consistent plot or goal of any description. But after that it just sort of fizzled out. It made for a poor ending.
Art:
Animation was very good, as expected of Kyoto Animation.
Audio:
Music was not anything spectacular.
Voice work was very fitting, no complaints there.
Characters:
The characters are passable but pretty shallow in the development department. I like Oreki, because I like intelligent characters, Chitanda is a manic pixie dream girl if I ever saw one but her smile makes my heart melt so I guess I'll let that slip a little bit. Mayaka and Satoshi were pretty bland.
Athmosphere:
It had a jarring feel about most of the minor mysteries. Overly dramatic and ominous. Otherwise it was generally plesant.
Verdict: 6/10 or " Above Average"
Rewatch: Maybe
Disclaimer: I am not a serious reviewer of any description. Take my opinion with a grain of salt.