Its a good point, new players are likely to be put off the game by joining the light servers, which are little more than 'ghost' servers anyway. the Main servers in use, that im currently aware of anyway, is, in rough order of population;
1. Bloodfin
2. Bria
3. Chimaera
4. Ahazi
those are the only 4 servers that i know for certain are relatively active.
the only way to discover if its worth playing, is strangely enough, by playing, if you have the game already, all you are risking is a months sub.