They don't have bad stats!!! They are a SM that has 2 attacks, can get back up and can cause people to hit them on a 6! I wouldn't call that bad stats!
I'd say they'd work great as a scare unit. Infiltrate them close to the enemy and watch them stop a whole flank because your opponent is afraid of them. Or you can deep strike them behind enemy lines and your opponent either has to waste his big guns on them, or risk them in CC. They work great in conjunction with Pariahs too.