After several episodes mired in romance, "Justice" puts Arthur and Guinevere to good use, as they rid the land of evildoers. There is no hint of further angst between them and both are useful and productive for once. We see that Arthur is an upstanding guy or fight for what's right. Thankfully, there wasn't an over the top Maoist land distribution and was confined to fulfilling the mild punishment--banishment--that he ordered and killing those who wanted otherwise.
Meanwhile, Morgan dishes her own justice, a deceptive, manipulative form, which is in clear opposition to Arthur. She manages to win over a large crowd and is poised to fully oppose Arthur. Not on a particular side of the spectrum, Merlin purges himself of whatever consumed him last episode, but there is definitely something dark still inside him.
Score: 8.7/10