Let's look at some numbers of Hensley's from 2006, shall we?
We have a pitcher who doesn't have good control (high walk rate), has a low domination rate (low K rate) and terrible command (low K/BB). The ONLY positive in his skillset is his GB/FB ratio, which limits his homers allowed. He also had a FIP of 4.11 and xFIP of 4.49, so his low era looks like an illusion. So exactly why do people want this guy on their fantasy team?