I really don't understand the logic that went into making that the 3 star reward.
The costume is cool and all, but it's just for one character, and honestly there are better alt costumes, like Grundy's Boss costume, or even Godfall Superman.
That is such a huge time sink and so much effort just for one costume for one character, at least for MK9 fleshpit mileena, it took a bit, but you could skip missions if you want and cheat your way to the outfit, and the outfit was something that would appeal to a large amount of the audience even if they didn't play Mileena.
Plus they revealed the costume to us weeks before the game even came out, it's like they are straight trolling people with this.