The output for DCDiag can be a bit tedious to read through when you just want a quick check to see if everything is happy. This script that I found at http://www.anilerduran.com/index.php/2013/how-to-parse-dcdiag-output-with-powershell gives you a nice little dashboard.

# http://www.anilerduran.com/index.php/2013/how-to-parse-dcdiag-output-with-powershell/


Import-Module activedirectory
$DCs = $(Get-ADDomainController -filter *).name
$Results = New-Object System.Object
$Report = @()

Foreach ($DC in $DCs)
{
	$DCDIAG = dcdiag /s:$DC
	$Results | Add-Member -name Server -Value $DC -Type NoteProperty -Force
	Foreach ($Entry in $DCDIAG)
	{
		Switch -Regex ($Entry) 
		{
		"Starting" {$Testname = ($Entry -replace ".*Starting test: ").Trim()}
		"passed|failed" {If ($Entry -match "Passed"){$TestStatus = "Passed"} Else {$TestStatus = "Failed"}
		}
	}
	If (($TestName -ne $null) -and ($TestStatus -ne $null))
	{
		$Results | Add-Member -Type NoteProperty -name $($TestName.Trim()) -Value $TestStatus -Force
	}
}
$Report += $Results
}

$Report | select Server, NetLogons, KccEvent, Replications, Services, SystemLog, SysVolCheck | ft * -AutoSize