I'm not really seeing much point in Wraithblades when you could just have D-scythes instead. They'll win pretty much any combat because Overwatch D3 S4 AP2 Ignores Cover Instant Death on 6 hits each.

As for Striking Scorpions, I generally have pretty good success with them. Great for killing off backfield annoyances, and very much capable of taking on frontline units if you need them to. Scorpions Claw of course. Also they still have Bladestorm and Battle Focus, so while they aren't in assault range they can still kill off a few guys pretty well, or even if you just want to put more firepower into a unit you don't want to assault.