So, does Mentoring make you level faster?

[Malzian]

Actually you teach them you can powerlevel them up to 60, because the game starts at 60, not 1-59.

Entirely false. You might feel that way, and I am assuming you're all about the end-game raiding with this mentality. Other people don't see it that way and there is a LOT of content between 1-59.