Why would it not being Ruby-based be a plus? Go is a big improvement over Ruby in some use cases, like where performance or concurrency is important, but this is not one of those cases.
Ansible can be plenty slow at time too.
Yep, I've never been a fan of Ansible. Beyond that slowness of it, the fact that it's duct tape of YAML and shell with randomness and a sprinkle of YAML craziness make it really hard for me to like it.