This Unmatched set is just as great as all other ones. The back cards art are much better than the Teen Spirit one. The character are pretty strong, which makes for good match up with the Marvel set.
Of all three, Black Widow seems the weakest as she is more complex to play with her mission cards. Although the Winter Soldier's ability seem boring, he is quite a strong character with some great attack cards. Black Panther is absolutely horrible to play against and see your cards getting stored in his suit. We love it!