Taking a look at the server personality polls that Mistryl posted in March and continuing, there's a few interesting points:
Every single server listed PvP, PKing, and clan wars as a major part of their server (top 3, usually over 20%).
Lionna was the only server to list role-playing among the top 3.
There are clearly 2 tiers of servers in population. Sieghardt, Kain, Lionna, Erica, Gustin, Devianne, and Hindemith all had <5% responses saying high population. The other servers were above 20%
Hindemith and Devianne are the only servers with many strong alliances. Erica, Gustin, and Franz all have dominating allies (Franz's poll is older than the other servers however, could be out of date).
Hindemith also wins the drama queen award, 28% responses. I'm very disappointed in Lionna, a mere 20% despite Artbunt's best efforts.
No server listed helpful players as one of its top 3 attributes. :( Lionna came closest at 13% though.
Its not scientific, some of the polls only had 50 or so responses, representing less than 20 players. Still, fwiw.