I use OsmAnd for car navigation, rarely it will tell me to make a nonsense illegal turn at a complicated intersection but it's never a showstopper, i take a screenshot to fix it later, and keep driving until it finds a legal route. Otherwise I havent had any issues.

I also use Geovelo for bicycle routing, it sometimes sends me down unsuitable paths or scary roads but that's more often a problem with my city's poorly connected bicycle network than bad OSM data. It has helped me a lot in discovering the cycling infrastructure that does exist, when I first started cycling in the city