It's an embodiment of the kind of quality adult film that really shouldn't be an endangered species, and a love letter from Affleck to the industry that made him, shunned him, and loves nothing more than to be loved.
Argo has that solid, kick-the-tires feel of those studio films from the 70s that were about something but also entertained. Only it's as laugh outright amusing as it is sobering.
An impressive mix of serious suspense filmmaking and ironic, mood-lightening humor. And it has the added distinction of being mostly true, based on a declassified CIA operation.