Really depends on where you are in Europe. Out here in the boonies of Portugal, it’s excellent if you’re driving a 4x4 pickup truck, which is the only vehicle of mine I use it with, as it picks very direct routes, which often involve ridiculously steep muddy dirt tracks, very narrow bridges, and generally just very underused farm tracks.
I tried using it in Bosnia, once, and it decided to use an abandoned airfield landing strip as a shortcut. Wild stuff.
In the Balkans, both Apple Maps and Google Maps are completely lost.
I frequently drive through Serbia/Bulgaria/Montenegro/Macedonia, and if you ever do, do yourself a favor and install something OpenStreetMap-based.
Otherwise, you will be missing new motorways, get thrown on unpaved roads, or even asked to drive on roads that just do not exist anymore.
This is my exact experience, but with Google Maps. Constantly suggesting gravel (or worse) side roads instead of highways and hallucinating multiple turn lanes etc on a country road about 1 car wide. It's been a few years, but I still remember the time I was in Berlin and buses didn't run due to bad weather, but I had a flight to catch so I had to walk to the Tegel airport and the route Google maps recommended ended up being quite an adventure, having to crawl through a hole in a linked fence on an unlit dead-end road next to the airport.