While I do not believe that SAM is "broken", it does have the ability to pretty continually put out decent damage on high level mobs. This can't really be seen on an XP party parse. The problem is not so much with the job itself, it is with it's WS modifiers and the Hagun, which combined make SAM scale better against high level mobs than any other job.
In reality, if allowed to truly "fight" a mob (like against say a Chariot) then the difference between almost all of the DDs (MNK included) is pretty small, and swings greatly based on player attentiveness and gearing.
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