I have another suggestion for you.
Gandolf Parker (GP) runs a server for blitz games.
go to
http://game.dom3minions.com/bin/blitz_chk.cgi
and follow the directions for joining a game.
The games are annonomous, The good news is if you get beat no one will know. that shoudl help you get the swing of MP before jumping into a newbie game on llamaserver