It's not a terrible phone. I bought one off eBay for about $150 as a backup phone and device to mess with Android. Turn off Facebook Home and you have a very capable midrange phone. Display is beautiful, battery is good, and I like that the body is really low key. The only part that sucks is the camera and the fact that it'll probably never see another Android update ever again. But without Home on, it is practically a stock Android experience.
This.
But how can they make a Facebook phone with a mediocre camera? In what universe does that make sense?