This is really really not true. I did a local comparison any Google map reviews were REALLY REALLY bad whereas Yelp knew what the good restaurants were. Not even close, at least in my area.
The lack of good data on Yelp in the U.K. has indirectly hurt other players there too, when Apple maps first launched business location information was largely drawn from Yelp, which basically seeded Apple maps with very bad information. Locations were wrong, many businesses that simply didn’t exist anymore would appear. Granted it’s been years since I last checked, but in the first few years of Apple map’s operation it was a pretty significant issue. This methodology worked great in Cupertino I guess...
Google Reviews of the Pacific Ocean.
yelp's review quality has been on the decline as of late though. it used to be great