sure!

1. it wasn’t tough to get started. it generally reads like a normal Unix shell with some exceptions. i don’t think many Linux power users would have a hard time doing basic file system tasks or launching programs, etc. there are going to be some issues, like you can’t just paste bash commands in because && isn’t supported, multiline strings don’t require the \ character, and string escaping is totally different. those are intentional deviations that i personally agree with, but they take some getting used to. and then obviously stuff that is specific to nushell like working with tables.
2. definitely the killer feature out of the box is manipulating, parsing, and reading structured data. the “aha” moment for me was when i needed to change a value over a thousand or so JSON objects and did it with a one liner. then i use it with some extra overlays to do stuff like connect to a k8s cluster like k8s connect (helm stage dev.0) which reads my YAML config and connects to the cluster specified in that file. or making a call to our internal package store to get the latest version by parsing the returned JSON.
3. it works out of the box with your existing PATH (or Path if you’re nasty). you can just drop into it and it will have all the path stuff inherited just like if you launched zsh or bash. you’ll have to set that up if you want to use it as a system shell—like i do—, but otherwise it’s pretty seemless.

you can check out my collection of scripts here: https://github.com/covercash2/dotfiles/tree/main/nuenv

ETA: if you do have compatibility problems or need your old muscle memory to do something quick, it’s easy enough to use bash -c old_script.sh or just drop into a different shell