Happens very often that you have a good connection (NAT 2 and ps3 as dmz server in my case), but you meet an opponent with a very bad connection.
In better cases, the problem is in his upload ports or speed, so the ball freezes just after he hits the ball and this doesn't affect the game overall...
In worse cases, the problem is in his download ports or speed, so the ball freezes just before bouncing in his court, and the problem is that your opponent is able to choose the correct direction during the freeze (even if you make a wrong foot shot hitting lines and he chose the wrong direction at first...), so it's almost impossible to hit a smart winner like a wrong foot shot or a banal shot while he thinks to go for the wrong foot direction...
I think this situation sucks a lot, because it isn't my fault if my opponent does not have forwarded ports or hasn't set his router... i think that even with a 56k modem you can play well at ts4, because it doesn't use lot of bytes....
So it would be nice if we were able to stop the match and talk to the host about the connection...