First of all you should know that the Monk is very mobile and provides a very interesting advantage, but that's not all. With his powerful spell equipment he is good in any of the current encounters. The Windwalker Monk is very powerful, as the ranking below shows.
This is an approximate ranking of the performance of each Class/Specialization
As you can see, the Windwalker Monk comes second for the 1H version (one-handed weapon) and fifth in the 2H version (two-handed weapon). We will begin with the choice of Race, the Profession and the optimizations of the Windwalker Monk.
WoW Professions Guide: Skinning Leveling Guide - Gathering
Protection Paladin Guide - 5.2
WoW Profession Guide: Inscription Leveling Guide - Production
Combat Rogue Guide - 5.2
Subtlety Rogue Guide - 5.2