All is apparently right with the world again now that the Google Maps app is available for the iPhone. Yippee! I'll probably download it myself, if only for the superior transit routing option.
That said, I've been using the Apple supplied Maps app for the past couple months, and I don't see what all the fuss was about. The turn-by-turn voice instructions have proven a boon, and they haven't guided me off course once. They're sometimes slow to recalculate when I stray from the plan, but the old app didn't automatically recalculate at all. (Or provide turn-by-turn voice instructions.)
Yeah, I know the data behind Apple's app is reportedly better in Seattle than it is in a lot of other cities. But I live in Seattle. So it's been fine. Different, but fine. And certainly a helluva a lot better than the nothing we had before we all got smartphones.