I think this is going to be the most controversial armor set this tier among players, and I do not understand why. Personally, the rogue set just looks cool, no matter what it is based on. Tier 13 is the fantasy tier, as has been mentioned by Blizzard over and over in each of the tier 13 reveals. At this point in the expansion, the designers and artists are having fun making their versions of cool armor and fun ideas that they've been kicking around. From Time Wizards and tentacle faces to Deathwing look-a-likes and Azerothian bat men, I think this is one of the most unique tiers yet.
And really, who epitomizes rogues better than the Dark Knight himself?