Your link is broken. But I tank with a ghoul all the time when I am in my DPS tank spec. Glyphed the little guy does pretty good DPS and with only one point in NotD you can keep him out about 95% of the time. However, Im very well geared and can afford to slack on some of the mitigation talents like imp AMS or LB.
But in the spirit of tanks doing respecable DPS, the ghoul is about a 400 to 500 DPS contribution in tank gear with the glyph. He adds nothing to your threat, but it is more DPS you are doing.
I cast the spells that make the people fall over.