Simple way to obtain SharePoint 2010 Farm patch level
The following PowerShell script will get the patch level of your farm:
1: #gets the build string for a SP2010 FARM
2: Set-ExecutionPolicy Unrestricted
3: Add-pssnapin microsoft.sharepoint.powershell -EA silentlycontinue
4:
5: $farm = Get-SPFarm
6: $version = $farm.buildversion
7: $version