Apart from the stupid decision to sell a box set with less than max dice my problem is that with Justice and this Xmen box I dont believe you can even field a full team with 20 dice from the box.
I know in this X men set there are only 2 characters with 3 dice which means your other 6 cards will only have 2 dice each max. that only makes 18 dice! Ad heaven help your opponent who will only have 16 dice and nobody will ever use the cards that only come with 1 dice cause then youd be playing with a 'full team' of only 14 or 15 dice!!!
So this is and always has been purely a cashgrab method to squeeze money out of us. Clearly they always wanted us to buy another set and now they have made it so we have to or we cant play with this set on its own. I think the Justice set was the same.