Helmet, I am willing to state that I know FAR more about swordfighting than you do. You clearly haven't got the FIRST clue about how any of these things work at all.
Nick Gillard, on the other hand, knows exactly what he is doing. Qui-Gon and Maul fight with a disciplined style all the way through that fight. But Obi-Wan fights, though with great speed and vigour, with a loose, undisciplined and completely wasteful style. This is deliberate.
The best example is the bit where they come through the foorweay after Maul uses the droid head to open it as he walks backwards. Maul is assailed by one side. He fends off Qui-Gon, to our right. Obi-Wan has a clear shot at Maul's side, but instead of a swipe he begins a TWIRL- a useless, pathetic twirl that leaves him with no guard at all. Maul contemptuously kicks him in the head.
Watch it frame by frame and watch Obi-Wan begin his twirl. That is the miatake of a novice.