We didn't need Qui-Gonn.
As much as I liked Qui-Gonn I don't think he was needed. It would have been better if Obi-Wan was the master in TPM and he had an apprentice, maybe female. After he found Anakin he said that his apprentice didn't need him anymore. But of course the apprentice wouldn't have much time to feel dissapointed as Darth Maul would kill her.
One of the main problems I had with TPM was that Obi-Wan wasn't given enough screen time. I felt Lucas got side tracked with characters who weren't important and I hope he doesn't make the same mistake in Ep2.