None of the Guardians were even hurt by it despite being slammed around violently. This movie was like a cartoon. I mean, that scene with Drax bouncing off the trees? That's some looney tunes shit. I'm pretty sure these characters are immortal like Wile E. Coyote.
I would say it's quite powerful, but on the other hand the Guardians chose to fight it using only their more or less standard blasters, a sword and an pair of knives. What we dont know however is how well it takes to a bolt of lightning or a magic hammer.