Just checked an area of Marin county on my iPad with iOS 12 Beta on it -- definitely has more detail in the spots I checked.
current Apple Maps
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Maps iOS 12 Beta
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Google Maps, which just shows a blob where that park is
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Sure, this is a cherry picked spot in an area where it looks like they're focusing their efforts -- but I think we can see there's steady improvement. And even the current non-improved version is a lot more useful than Google's.
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Used Apple Maps for a 2,000 mile road trip last year on the East Coast and South of the US, and it never let us down once, even did tons of rerouting through secondary roads to keep us out of traffic on the highway. I know it's less strong outside the US, but I find it very reliable here. Honestly the weakest points in Apple Maps are search-related -- it returning a dumb, far-away result instead of something that's less than a mile away. But other than that, routing is very solid and transit options have gotten quite good where I've used them.
And yeah, privacy, like you said.