it seems it has been nerfed. ive tried twice with 2 different char's and i get around 1.3% of AA xp per zone in, where as before i'd recieve about 2 full AA's worth of xp. i guess it may still be useful for some sort of afk macro, but that seems to be about it.
one way to keep this around for an afk macro would be to know if its possible to create a plugin of sorts that can get the task for you without hailing. 2nd part is to get all of the toons to automatically drop the tasks, and having the toon being leveled zone in for 10-15 seconds and zone out.