I'm just going to assume that "Secret Society of Super Villains" and "Secret Society of Super-Villains" are going to be one in the same or errata'd.

so, how do you create a duplicate? or do you just play a couple at the start as part of your force? he doesn't seem to split like how mob rule does or even multiple man from WoATX

He can get costly to build w/ multiples, just like the old REV one, but he's well worth it. He'll grant any friendly "Mirror Master" Sidestep via his speed power, which is amazing for the FF and REV versions. Take a shot with the FF Scudder, then Sidestep him over next to some blocking terrain. Or Sidestep dupes in his way. Sidestep & carry with the Exp version from Origin for 58 points. So many mobility options for him and his friends.

I don't like that he lacks any from of Improved Movement, and doesn't have a move power to make up for it. I ALSO don't like that when playing for duplicates you only get one Perplex out of the bunch. Even with this dings, I do really like this Mirror Master for being a WC with the ever annoying SC/SS combo while giving some scary mobility when played with duplicates and/or older Mirror Masters. This figure single handedly makes me consider a serious "Hall of Mirrors" team, because stacked Sidestep-carrying is crazy awesome. Having Precision Strike to remain a threat and that thematic blue-click up the center dial help him be worth the 80 points even at five clicks.

Getting 4x E Mirror Master from Origins removed from base just for click #3. LOL.

Aargh, I've tried on a couple occasions now to build a solid 300 Point Themed Team with this Scotsman and just can't seem to get it right. I've tried an Assassins Team with SoG Deathstroke and 3 Mirror Masters, a Rogues Team with Rainbow Raider, Reverse-Flash and 2 Mirror Masters, both Teams got blasted to smithereens. However in all of the games, McCulloch is always the last one standing on my Team BUT he wants sweet victory, like Shia LeBouf wants to be popular again! Anybody had better luck? (No need to answer, Shia, we all know your luck ran out years ago ...)

This is how it works in comics, but I need to be certain it works in-game.
He can carry and then swap places with another MM, right?

As two separate interactions, yes. A Mirror Master, however cannot carry someone while swapping with a second Mirror Master; the swap action is placing Mirror Master and not giving him a move action, which Carry requires to be used.