The native sync currently hinges around the core objects of Lead/Contact/Account/Opportunity. I do come across use cases more and more frequently though where the Account-Contact Relationship in SFDC manages more complex relationships between a contact and multiple accounts. Use cases range from external consultants / influencers on more than one company, several sites in different countries within a customer being logged as separate accounts and a stakeholder playing a role in more than one, etc.
The set-up in SFDC prevents the contact being entered more than once to indicate their role in every account effectively, so is really great in avoiding unnecessary duplicates. It would be great if the data model in Marketo would also incorporate this added complexity.
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