The trailers were rather cool, but the game came down to running around and mashing buttons in a rather ugly interface on your phone.
I think this is pretty common evolution for games. Games from bridge to Magic:The Gathering to softball are as much about the social elements as they are about the actual gameplay.
Which is probably why I quit; I much preferred walking around on my own, rather than trying to coordinate with people.
Oh well. It wasn't for me, and in the month or two that I played it, I did see some pretty neat stuff around the city that I hadn't before.