If you are running the refridgerator AND the unit is down you SHOULD run the fan. Otherwise there is insufficient air flow across the fins and it will not cool properly, not to mention allowing heat to build up in the area which could warp parts of the surrounding area or cause a fire.
When the unit is set up, you don't need to run the fan, BUT in hot weather I often DID as the increased airflow improved the heat transfer rate and the efficiency of the unit. As others have said, it is not the most efficient unit and takes a while to cool down so any improvement in the operation is a good thing in my book.
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