Exceptions and ErrorRecords, for whatever reason, need to have the -Force switch used when you pipe them to Format-List and such. I forget why that is, but PowerShell really really wants to display them the way it thinks they should be displayed. 🙂
To get the type of the exception, $_.Exception.GetType().FullName should suffice.
That would be very unusual, but not impossible. .NET code (including PowerShell cmdlets) generally considers it a bad practice to just throw the base exception class, rather than subclassing it to something more useful that can be caught and handled specifically.