These guys were kind of pathetic.
I could think of two good times they should have been mobilized to take care of a threat, but only show up to prevent Yusuke from being a demon.
Like many military members, they let their orders dictate their actions versus seeing the truth.
They did have nifty magical abilities, and all members were as strong as A-Class demons.
Once Yusuke is reborn, he is too powerful for them to stop.
And oh boy, they had an awkward meeting with their boss after that.
They ironically agree to help Yusuke, once he wants to go to Demon World.