Need to map the Mailchimp Member rating back to your CRM / Financials Software?
You can map to a Text field works fine as the Contact Rating (Member Rating) is a negative number to a positive number based on Stars given.
Head to Step 4 of the Sync Profile then map the Member Rating from Mailchimp to your CRM / Financials Software. Make sure that the mapping direction will be from Mailchimp to your CRM / Financials Software.
See Mailchimp help article here...