Kind of sucks because it's a disease so any priest,pala can ninja cleanse you and remove it.
On my realm we managed to get Vol'Jin infected(thrall seems immune) and a few bankers and auctioneers.
When you are a ghoul you are losing life somewhat fast and need to keep attacking mobs to proc "bite" so it heals you up, you can also explode, do a slime pool that infects other people and a few more abilities.
Needs to be easier to spread to be more fun imo

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http://eu.wowarmory.com/character-sheet.xml?r=Draenor&n=Andryana