The cmdlet returns the full "ReducedRecipient" object, so you get a lot more properties than just Name and RecipientType, you simply need to "instruct" PowerShell to display them. Here's an example:
Get-DynamicDistributionGroupMember DDG | select Name,DisplayName,PrimarySmtpAddress,RecipientTypeDetails
To get the full set of properties returned, use the Get-Member cmdlet:
Get-DynamicDistributionGroupMember DDG -ResultSize 1 | gm