The +1 attack would actually make them quite good for the points. Sadly, Oni Leader is a very bad way to invest 75 points, so those gamma men will never see play from me...

i like my generic swarms, but i have to agree with Orpheus. Especially with the TMT rock trolls for same point value running around. like the Oni idea, but it is poorly executed. oh well. may field them and oni leader anyways just because i can.