Level faster? Check - bonus exp while under 20, and a ring from hall of novice for bonus exp under 30
Better players? Check - Actual people who play the classes helping newcomers learn rotations, skills and tips.
Better endgame community ? Maybe , if newcomers subscribe to the "pay it forward" mentality.

This mentor stuff could be a great thing, if the community uses it properly.
Needs less "whats in it for me".