Okay, 5 games of Nightfall later, we still like it, and that darn woman is in the lead with 3 wins
Luckily she likes the game a lot.
As for my opinion...it´s really good. The lack of different cards is bad and good at the same time, as always. Bad because the game has less combinations that way, good because you learn the existing ones better when they show up all the time.
The speed of our turns has vastly inceased taking under 30 seconds most of the time, making Nightfall a really quick game. The only time the whole thing slows down is when one of us needs more time to work out his chain or when reworking our hands to react to the opponent´s chain. Both of us use the Kickers way more often which makes us stronger but also more predictable because each card can only kicker 2 other cards in the base-set.
If you like destroying your opponent, managing your ressources, having a combination-element like in UNO (or Mau Mau, the game that inspired Uno) all together in a quick small game, I´d really recommend Nightfall to you. Really good stuff.