I hope Apple doesn't buy Waze. The best part of the app is that you get a head's up for police--and Apple will definitely kill that feature. Waze is cool for the crowd sourcing aspect, but it had to mature just like every other GPS implementation. For a few months, Waze wanted me to take an on-ramp that didn't exist. Eventually it was fixed. I have no big issue with Apple Maps, but those issues that I have noticed will be fixed over time.
I don't get why everyone conveniently forgets how crappy Google's mapping service was just 2 years ago. I was driving through Mississippi once [just once] and it totally hosed me when it said that a Starbucks was in a residential area way off the interstate. They all have to mature.
Great. The least accurate maps app gets an assist from the 2nd least accurate. Perhaps in regions with relatively intelligent users, Waze is ok. Here in Florida, it's a joke. It's inaccuracy is close to 50% in my large metropolitan area.