Is it good? Is there a growing user base? Why do I not hear about it?
However, I will say I feel the Nomad stack is quite good and fills a nice space where full-blown K8s is way overkill or just not the right tool.
We have several thousand hosts in a single cluster across Windows/Linux, all hooked up to Nomad/Consul/Vault and it takes some effort but our team isn't that big and we manage it. With the most recent releases of Nomad and Consul they truly shine at both ends of the spectrum, small/simple and extremely large/extremely complex.
Nomad/Consul/Vault/Fabio are super easy to setup, and its like 10% of the effort of handling your own kubernetes.
Documentation could be worked on, but its getting better.
I am of the belief that there's an inverse bell curve of support for Kubernetes coming from 1-3 person teams and large companies. either you've got a 1-3 person engineering team who understands the whole thing, or an enterprise that can support it with a team of SREs helping keep the manifests in order. anywhere in between can become chaos quickly if you can't support training your department on it.