>>376220854
a) Join explore groups
b) when browsing through worlds see if it has a detailed description
c) try looking through other people's favorite lists of maps
d) things advertised in twitter are usually good
e) photographers have pics of them

The heuristic here is if the thumbnail, description and advertisement is there then there is legit EFFORT placed in making the map higher likelihood of being good.
This is usually how I go about it.