> I cross reference Google Maps with Waze all the time back when I used it, but I wouldn't dare call Google Maps unreliable
Unless "back when I used it" refers to pre-2013, I'm not sure I'd describe that as cross-referencing.
It costs time?
Not the person to whom you were responding, but does it really cost that much time? If I need to be sure of where something is, like for a job interview or a time-critical meeting, I'll check as many sources as I can.
Disclaimer: I'm from New Zealand. Map data is constantly out of date here, no matter which vendor you deal with. Google, Apple, Bing, OSM, whatever. For me, double checking is no problem.
I've been to NZ in the last 10 years(2015), and used Here maps (because I was able to download the entire country map and use them all offline) and had no problem there. I was in the south part of the South Island, from Dunedin in through Roxborough and Alexandra, so not the case of just sticking to Auckland or anything.
Eh, I cross reference Google Maps with Waze all the time back when I used it, but I wouldn't dare call Google Maps unreliable. It costs nothing to do, so why wouldn't it?