okay m1 killer :^)

their power is purely for farming injures

I posted a pretty exhaustive description of my own experiences and thoughts playing Legion there, but if you don't happen to have the time or desire to read something like that I can TL;DR by saying they're average to a little bit below average in terms of overall power.

With the right perks (I personally run BBQ/Thanatophobia/Pop/Sloppy Butcher) and good core mind-games and mechanical skills they can perform without being seriously disadvantaged. They're not terribly competitive in terms of overall power and their add-ons are kind of a mess (especially Stab Wound Study and Frank's Mixtape, which I talk about in my post) but the frustration of their power without the kind of serious limitations it faces currently is too much for survivors to have fun.

if you focus on a solid, coherent build and play well you can dominate games but they do have to work harder than a lot of killers but they're not demonstrably awful the way some poor buggers (*coughClowncough*) are.

If you play smart with him during the match he's actually an OK killer. Nothing special though