There are now entire countries with completely useless maps. Is that fair to iPhone users in those countries? Even in Canada and the USA, thousands of small cities that formerly had detailed maps were "wiped off the map" with this update. So while millions of people think things have gotten better, millions of people can also legitimately claim Maps is not just "worse" but completely broken.
For the people who live in cities with turn-by-turn navigation and 3D flyovers, hey the new Maps is great. Apple has sacrificed a product that was good enough for most people with one that is great for some and terrible for others. It's a tough decision for them to make, and they should have still used Google Maps app for those who are affected negatively since theres still so much time left on the contract with Google.