I have played about 10 games online and have not won a single match.  I don't think I have even won a single game, let alone a set, let alone a match.  There have been a few games where I barely even picked up a point.  What gives?  How come everyone is so good and I am so bad?  What am I doing wrong?

Do you play with or without the nunchuck?
M+ or without?

Practice Practice Practice.

From what I hear it is a very time intensive game, in a similar respect to Battalion Wars online... someone who has spent more time with it will usually beat you. (some I am certain are in disguise as new users though... probably used a seperate file to practice the online on before)

I play with nunchuck and M+

Somebody has to be the worst.

That's mean..

Well with BWii I felt absolutely terrible at first, I mean I had been through most of the 1player story of the game already before I went online, but I got on and lost my first 8 games being totally thrashed. With BWii the learning curve is strategy based... with GST I imagine it is learning how to place the ball where you want.

So yeah, if you are impatient it could be a problem.... but it will probably only be a few hours in reality, an hour or so every day could probably count as excercise too by the sounds of the gameplay.... And of course you shouldn't be playing thinking of Wii Sports Tennis either, as GST sounds mch more involved.

There is nothing wrong with losing anyhow.... when you came back to Mario Kart after not haveing been on in a while you were losing all the time, but the last time I saw some results for the American league you won 2 of the 3 GPs, and came 2nd to tuan in the other GP.

Do non-M+ players have an advantage online? (less mistakes)

I'm probably much worst than you right now. I just got the game and tried it for about 45 minutes (With M+ no nunchuck) and I can barely place anything. I think I might be doing the calibration wrong because the game sometimes thinks I'm in backhand position while I'm actually in forehand. But the thing that drives me crazy right now is that the game thinks I'm trying to hit the ball when I switch from forehand to backhand which screws me over big time.