powershell's json handling leaves a lot to be desired. It's been awhile since I poked around but I never found a good parser and usually just switch to python for that and basically everything else to do with APIs (invoke-webrequest is really annoying to use also).

powershell is good for controlling the windows operating system and doing basic things with objects. sysadmins are more likely to have a decent time with it than developers. Although, you can use it to interpret dotnet which is kinda neat.