Try like this.
If you leave out the Where-clause, you'll get the state of all paths.
Get-VMHost | % {
$server = $_
($_ | Get-View).config.storagedevice.multipathinfo.Lun | %{$_.Path} | `
select Name, PathState | `
where {$_.PathState -eq "dead"} | `
Add-Member -PassThru NoteProperty Server $Server.Name | `
Select Server, Name, PathState
}
