I've just updated the Get-DAGHealth.ps1 PowerShell script to version 1.1. The new version fixes some bugs with how the replication queues for lagged copies are handled, which seemed to be causing incorrect report results.
As an additional update I am pleased to announce that the script is now tested and working for Exchange Server 2013 database availability groups as well. I have not yet tested a mixed 2010/2013 org though.
You can download the new version here.
Please continue to report bugs and make feature requests in the comments on that post.