I've never used it, but every NIMS course I've had makes my head hurt. Too much explanation of obvious concepts, too little emphasis on implementing it effectively. By effectively, I mean in an easy, intuitive manner. Instead, they're so bent on names, titles, documentation, that you need a meeting just to start the response properly.

I'm not saying I can do better, but it seems that, like most government mandated things, it's a bit cumbersome to implement. It might be OK for long events (like those wildfires), but a short term event seems a bit extreme.