Apple Maps navigation used to do things like take me to vacant lots in major midwestern cities instead of the correct property which was several blocks away. Sounds like it works reliably well outside of California now?
I live outside of the USA, and Apple maps consistently screwed up to the point that I've deleted it.
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?
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 Map data is constantly out of date here, no matter which vendor you deal with.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.
Unless "back when I used it" refers to pre-2013, I'm not sure I'd describe that as cross-referencing.
So, one anecdote for, one against, it evens out for now.