[--Chris--]

Personally I believe they need to be of a certain quality to reach the Classic tab, not just throw in whatever is best even though their standards are low. I'd like to see the tab only have the following:

Graal: The Adventure
Graal 2001
Era
Zone
Valikorlia (only because it's an RP server which doesn't neccessarily have to excel content wise and like MG said, variety is good.)

Other than the above, only the things with worthwhile, good quality content such as Archiac, Sanstrata, Oasis and New World should go up. The tab should also be limited to the amount of servers that can be up at one time, I'd personally say somewhere around 5 (not including "Stefan servers.")
Not only will it be easier to determine when a PW is actually being disliked (if it has no or a low playerbase with a fairly small amount of PWs on the tab, then you know something is definately wrong) and needs to be replaced but they'll be easier to moderate by the GGT, GST and PWA, motivate UC playerworlds to better their production and give a good impression to new comers when they see the type of player-made servers chosen to represent Graal.
I believe the 5 servers I mentioned that can currently go up will have a pretty nice playerbase (which they all essentially need, especially Graal 2k1) and over-all more players would have a good time.