Some of my friends are mad about it. I've been out with them and turned to say something only to see they're now across the road, under a tree, trying to catch a Pokemon. I got the game the day it came out in the UK and since then I've mostly been unable to play due to server issues. When I have, it's been a novelty but for me it's not that addicting. Maybe it's because all I'm doing right now is walking around to hatch the eggs that are in the incubator.
I would play it instantly if my phone supported it. I would probably also travel around the country on my weekends if it could net me a more diverse number of them. As it is, I am replaying LeafGreen.
I'm waiting for a J2ME version of the game.