Is Calm Spirit good?

It's near useless against anyone who isn't doctor.

That still doesn't make it any more useful, as the core part of the gas bottles isn't the survivor screaming.

It's the bottle slowing them down.

It counters pretty much anything that causes survivors to scream, such as infectious, iron maiden, getting caught in bear traps, docs shock therapy, that one nurse add on, clown gas, and spies from the shadows.

Its an odd perk that has its uses but its situational!

It beats iron will atm. Too many Doctors...

At low ranks and inexperienced killers yes. Top notch killers will just laugh when you get smacked or hooked and no sound comes out.

Best off using Iron Will, OP. It's a meta perk at high ranks for a reason. And the only perks you should care about are the ones that are meta at rank 1.If you're going to be in an infectious fright radius anyway you better be on a gen, because if you're just doing nothing for the team then you're obviously going to let your team down. (And then blame it on the killer *if* you're an entitled, short minded survivor main who doesn't take responsibility for being useless because the devs encourage this behavior)

It's pretty crazy against doctor as others have said.

Also counters niche perks like spies from the shadows iirc.

Is it good? yeah does it deserve a slot? no

I would never prioritise countering docs they are significantly less of a threat then your spirits (iron will) or hex ruin undying (small game). Id argue its actually worse for your team since you getting downed means you team dosent have your scream as a heads up. However infectios fright is terrifyingly powerful which would make me sooner use it then docs running around.