If you liked Nightfall, but thought individual creature combat was too tedious? You'll probably like this.
If you liked Nightfall but thought the game was too slow to ramp up, or too long to finish/hand out all wounds, you'll like this.
If you thought Nightfall's "Private Archive" claims ended to overpower the game based on luck of the draw, you'll like Unchained's 3x3 market grid.
-----
As far as deck builders go, I like Unchained. It will take awhile to really know the card power combos. The symbols look overwhelming at first, but are kind of intuitive once you're used to how the cards work. Combat is total offense vs total defense and result is one fatigue (wound). So no MTG-ish "creature 1 attacks player B and creature 2 takes 3 wounds against player C." It does speed up and simplify the game a lot. The 3x3 card market is brilliant. You can get cards you want and/or clear out cards you don't want your opponents to get. Much more variety of cards to cycle through than 8+2 archives = 10 cards to choose from per game.
Solid 4/5 all around. I'd give 5/5 if there was a happy medium in combat between Nightfall and Unchained. Not as super simplified as Unchained, but not like Nightfall's individual cards combat. Maybe a power on some cards "stays in play after combat" so there's a larger chance of different strategies than "I punch you, you punch me, repeat"
