I'm amazed - it's only been a day and people have already forgotten how shit the old Maps app was. It was great for POIs, but it was lousy and even dangerous to use if you were using it while driving. I only used it for reference before I'd start a trip or if I were a passenger rather than the driver.
I also get a kick out of Google employees laughing at Apple over this. They wouldn't be laughing if they saw the ridiculous route that their app gave me to get from the 9th Ave. Garage to Schmidt's last weekend. There was also the time this summer when I was in Baltimore looking for a pizza place and it directed me to a highway overpass two miles away from the restaurant. They had a seven year head start on this whole maps thing, too.
These things take time, and nobody's maps are 100% perfect. This is a pretty ambitious undertaking by Apple, and I'm anxious to see where this goes. In the meantime, I hope they approve Google's 3rd party app, so we all have choices.
This all reminds me of how Waze was starting out. A couple years ago, Waze was shit. I tried it and ditched it for a while. Nowadays though it's pretty damn good and I've been using it regularly.
And honestly, if you're going to rely on your phone for navigation, it's probably a good idea to have more than one app on your phone for that purpose. With two or three different apps, you're more likely to cover the gaps in each.