So, I was definitely expecting this to be a lot worse than it was.
I don't really have a problem with her being able to defeat Mon-El. In my view, each member of the Fatal Five should be scary ass powerful. In fact, I'm kind of annoyed at how easily she seemed to be beaten by Element Lad in the next issue. The arm-loss thing seems particular gratuitous, though. I mean... it's not like it hasn't already been mentioned not too long ago that Daxamites have the technology to re-grow limbs, specifically arms.
Anyway, not exactly a great Legion issue, but...