I think it's just a matter of finding the sweet spot with a PC. Macs will come ready tuned, so that's why your teacher thought that!
Heh, not to sound arrogant, but when I was a school doing A levels, they installed a "studio" so I thought I would do music tech for my last year there. They basically just had the studio built, and then the music teachers were either expected, or they thought they knew what they were doing. It was only a Roland VS-2480 thing, but the teachers really couldn't figure it out, and I ended up doing most of the teaching for of the hardware and etc, and I also did most people's practical coursework - and all I had used before was cakewalk guitar on a PC!
Well, that does sound arrogant, but it was supposed to be a point about teachers not knowing enough about their subject matter.