US West, US East, and Northrend are about equal in activity with around 17,000 users. Kalimdor has 67,000 users who are probably all Chinese, since WC3 is more popular in China. Wouldn't surprise me if Kalimdor has a Korean minority. Probably a much higher skill level than US West, US East, and Northrend ladder.
You basically have to stick to North America/South America and Europe unless you're Chinese/Korean. --- "i see a few maggots came to feed on this topic's corpse." - Fony
I was under the impression China couldn't play on battle.net. Most of the players on Asia are Koreans from what I've seen. Skillwise Asia isn't that much better than west or east past level 30. --- billions of bilious blue blistering barnacles!
For custom games it doesn't actually matter what server you play on anymore since bots are capable of hosting across multiple servers. Pretty much all the bots do this. --- If you believe that Abed is the true Messiah and you are 100% proud of it make this your signature. http://oi44.tinypic.com/lfdsi.jpg