I'm disappointed there's no option for Devil Walkers. My friend killed one with a melee. So did I. It doesn't EMP continuously if your on top of it (HueHueHue), and it can't target. It's a win-win!
[spoiler]Unless you know, any enemy appears nearby. There isn't much cover up there.[/spoiler]
I love running around smacking everything with my Thunder Fist. Especially when I trade punches with a Fallen Captain four or five times before finishing him. Just something satisfying about knocking someone's lights out or watching them fly away or disintegrate from the sheer power of my arc fist.