Anakin is already a great pilot when they meet, but Kenobi is amazed at how strongly the force was with Anakin. He thought he could instruct Anakin as well as Yoda. He was wrong.
Strange how this is actualy a better definition of Qui Gonn. Unless in Lucas mind the PT turns this line to another lie from Obi-Wan to Luke. Or he just fucked up big time once again...