Powershell might have some neat features, but the verbosity of the commands (don't bring up shortcuts here either - you need the full commands as that's what everyone else is using) just drives me batty. I find that they don't lend themselves well to mnemonics or easy memorization.

Who needs ls when you have Get-ChildItem?

Who needs grep -r 'pattern' when you have Select-String -Path c:\ -Pattern pattern?

Now that I think about it, Powershell has a conceptual similarity to Applescript. A proprietary, verbose, and hard-to-discover English-like syntax belying a great amount of power over the target platform.