PES 6 servers are currently working with no problems at all.
This means you can play with any player with no lag. The servers are not like PES 2008 serves.
Regarding the number of gamer playing it, they are huge and increasing everyday!. You can pick up a player to play with very quickly.
When you just host a match, the same thing occurs.
The overall players are about 386,000 players and they are growing each day!.
However, PES6 transfers are out of date. For example, Henry is still playing with arsenal, Ronaldo is with Real Madrid..etc.
I hope I answered your questions and if you have other questions about this game, I am ready.
BUT I DON'T NOW WHY THERE ARE SOME PLAYERS WHO WANT TO PLAY LIVE STILL PLAYING PES2008 WHILE PES6 IS THERE.
Sorry if my english is not accurate.