The firewall rules being discovered and documented from the Meraki agent are Outbound Rules. Inbound traffic is restricted under "Forwarding Rules", which I would consider to be the actual Firewall rules.
I can see my DMZ restrictions in the inspector, but not a list of ports open to the internet. As it stands, this cripples the functionality of the inspector for Meraki firewalls.
Thanks for taking the time to give us this feedback!
We are in the process of adding these items to the Cisco Meraki inspector.