Ghost people are durable and might get up but in my experience they die pretty easily. They are a bit more dangerous then most in the Mojave but the reanimation thing is over rated considering how easy it is to dismember things without even trying in the Mojave. Any explosive or energy weapon would handle them fine. The cloud and holograms from Dead Money however would kill alot more. least if you positioned them right.
You're missing the point of the Ghost people People. Yeah Deathclaws and Super Mutants are tougher, but the Cloud people are so creapy! Is he dead? Is he coming back? Oh [censored]! What was that noise!?!?!? It's the Ghost People!!! And yeah the holograms and the Cloud would be more effective, but I don't know how you would deploy it. You could lure all of Talon Company into the Siera Madre Casino, letting them go after the money, and watching as the cloud, and the holograms turned them into piles of ash.