Because it’s crap. It takes ages to play, suffering long
action-free periods in which the players endlessly circle the
board in search of the streets they need to complete a set, and
lacks the interaction between players that we look for in a game.
In short, it’s boring and lacks skill.
Except that it isn’t crap. Actually. You just have to play it the
way it was designed to be played.
You just have to read the fucking rules.
I had no idea most people played without the auction rule. That’s the best part of the game. (Via Marco Arment, who has some good comments on the game.)