Fallen Haven wouldn't of been popular anyway; map was aesthetically mediocre and gameplay was less than mediocre.
Memory of Earth was also a bad map (for the same reasons as Fallen Haven); the lag was just the cherry on top.
Treacherous Heights is rarely played. For Mortal Skies the backslash indications "or", meaning I honestly don't know if it is still on the servers, because I've never seen it played.
Can you list your 14 maps?
Lol popularity doesn't make a good map? A map's popularity is solely based on its quality (which accounts for many factors - gameplay, tiering, terraforming, builds, etc.) ; the two characteristics are completely intertwined.