I knew it. See, Ogyrns aren't that tough or even that good in assault and yet they cost an arm and a leg. The Vanguards Radium weaponry will shred them in the shooting phase and the radiation effect will really hinder them in assault too. I think that realistically, a squad of Ogyrns could only really take on Skitarii Rangers in close combat, and I unfortunately for me I actually advised my opponent against taking those.
I would have liked to have taken them. I like the models and their fluff, and the idea of my army resorting to abhumans and pyskers against the cyborgs. What a shame.
In terms of the rules, I think Ogyrns are more or less fine as they are. They're just massively overpriced. Seriously, they need like a 40-50% reduction in cost.