What I hate about the some of the games I've played on clan servers, is that if it's one clan server, you see lots of different clans stacking onto that side. So it ends up being mixed randoms vs mixed clans.
At least the game is popular enough that if the stacking is too bad, it's easy enough to find a new server. No point in moaning coz no one will actually try to balance it.
I've seen it happen that on a clan sever the clan is stacked on one side and then randoms go and pwn the clans silly.
Good times.