Dang, too bad
The beginning gave subtle hints of the main dude's mental illness. It's because of his paranoid schizo condition that he has an unreasonable suspicion about one particular inmate. I agree it's more style over substance though. Similar to Ty West's House of the Devil (there I categorized it when I said I wouldn't) it has a great old-school horror atmosphere.
I've got AHS season 2 queued up for the holidays