Go to a restaurant in a city where there are mostly tourists and it's very likely that you're going to get disappointed.
Just like a restaurant somewhere in the middle of nowhere that has a pretty high rating on Yelp is very likely to be a lot worse than a restaurant in the middle of Manhattan that has a similar rating.
The free market works in both ways.
Where there's no free market (and only tourists for example), the quality will automatically depreciate.
Because if you don't depend on regulars it doesn't really matter if you cut a few corners here and there.
On the other hand, a free market with a lot of competition that mostly serves regulars will automatically lead to a better quality, but also to lower ratings as the ever increasing expectations (and a constant raising of the bar) make it harder and harder to keep up...