I think the issue with the Machina is that they pretty much [i]require[/i] teamwork and cooperation to get anything done, whereas most of the Angels and Demons have more than enough power within single units (PC's) that they can be far more independent. Frankly I imagine Grafdakka alone should be powerful enough to take on anyone 1v1, but knowing the sort of can of worms that opens up, I typically don't make him that powerful. If he manages to kill anyone it'll be because he's picking someone off that the others were already fighting.

I mean compare/contrast any Machina soldier that isn't controlled by a GM or former GM, and match them to another faction's character. The powers aren't quite on the same level, me thinks.