I see you keep repeating this in as many posts as you can and, quite honestly, it just isn't true.
Works fine for me and others as well. It's not always perfect, but its playable compared to 8v8...
Funny, somebody even has a thread on the first page. He plays competition 4v4 which is probably even less laggy. http://www.gamesas.com/index.php?/topic/1191550-no-lag-d/