I totally disagree. I Didn’t Sign up for This is at least playable on a mobile device (unlike the blitz mode); it does not require tediously reading every card description — and waiting for an opponent to read theirs (like Patience is a Virtue).
It is fast playing, easy to design decks, interesting to experiment with (at least for a time), and it allows certain cards to be experienced in their extreme.
Even though the balance is horrible — and ultimately rock-paper-scissorsish, I find the mode worthwhile on a limited basis