Powershell pretty much has universal tab-complete. Typing a command, '-', and repeatedly hitting tab will cycle through all available arguments for that command, and arguments will be quite consistent between commands. But you can also tab complete variable names and the commands themselves.

Discovering the cmdlets is not as trivial as it could be, because they are named verb-first instead of noun first. Get-<tab> is not as useful as NetAdapter-<tab> might be, but since things are named sensibly you can do a little guess work and use tab-completion to find what you're looking for in the vast majority of cases.