best rotation is to just follow the different combos like mm then mlm then mllm and so on and so forth. really he's usable anywhere but particularly helpful in fights where you need slow or big crits like the crit me with your best shot node
Usually my preferred rotation is MLLM (gives you Unblockable, enough for two short combos), MLM, MM, MLLLM into a H. Of course, if you need to Slow or Shrug off debuffs quick then MM/MLM first
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To explain: he has a variety of utility, but also has raw damage to back it up