In all honesty... the Guild recruitment forums that WoW has officially provided are subpar to a number of other websites that run similar resources. A forum is just not efficient or effective. Most of the good options use a database type approach that allows you to search various features such as guild focus, raid times, guild needs, Player needs, what level of progression etc.
That type of service means someone looking to fill a guild needs or a player looking to find a new guild spends a relative short amount of time looking for compatibility and doesn't spend hours looking at things that do not match what they desire.
WoW forums are pretty poor for that... the dedicated few will go past page 5 of listings. (which means people spam bump to keep their posts noticed) Lazy recruiters will do the copy/paste spam after barely reading the persons post which is a turn off.
I just want to second this, forums are a terrible way to manage recruitment.