Do recruitment advertising agencies deliver?

In my experience, I have seen very few advertising agencies that actually know much about online yet so many of then have a Head of Digital.  That's a bit like me calling myself Head of Gardening just because I mow the lawn and any overhanging plants that dare to venture into my domain!

So is it up to HR to manage the agency like a Buyer, or is it up to the Agency to deliver?  I've started a post on the Talent Management Network raising this issue which you are welcome to join:

Can HR learn from Buyers?  Join the discussion.