I made this as an example [0]. It's Google Maps, OpenStreetMaps, a local competitor (Hitta), and the official government map agency (Lantmäteriet) that Google used to buy their map data from according to their copyright info. Notice several features missing in Google's data, and how bland and low contrast it is in comparison. Speaking of which, try finding this road on Google Maps using your phone when the sun is shining: [1]
Google's aerial photos in the same area is from 2014 and is both lower resolution and older than the two alternatives I looked at.
I still use Google Maps quite a lot, but in my opinion they're slipping and doesn't seem to care about keeping data updated as much as having local guides reviewing restaurants and grocery stores.
Google is known for attracting top engineers, but their product managers seems to be some of the worst in the industry. Where would they be without their ad cash cow? It's been years since I got exited about anything they released. I think I noticed it getting worse right around when Eric Schmidt got replaced as CEO.
[0] https://trends.google.com/trends/explore?date=2016-07-01%202...