Yes have a few Nomad clusters in production and it's been great.

You'll certainly want to combine it with Consul and use Consul templates and service discovery though.

I'd say the difficulty and complexity level is between Kubernetes and Docker Swarm, not having to use YML too is a big benefit imho.

If that's practical experience that you need, I remember reading some studies comparing the reliability and efficiency of nomad vs k8s under load (spoiler: they do not look very good for k8s).

If that's popularity that you need, then sure, nobody ever got fired for choosing kubernetes.