Hey I work at PwC Advisory doing consulting work. The issue is that since each of the Big 4 (besides Deliotte) sold their practices, and they can't use specific verbiage as part of those deals. Hence the use of word Advisory. But they all do similar work. One of the main differences is Deliotte can actually do implementations. In my perspective and based on people I know working there, I would think think Deliotte is more of a Big 4 that also does implementation work a a la ACN, IBM, and Capgemini (all formerly part of a Big 5).
The type of consulting projects PwC Advisory does focuses on Financial Management, Health care, IT, Risk, Investigations, etc. It isn't strategy work nor technical implementation, but rather in between those two. While majority of Advisory are hired out of undergraduate, there are a lot of MBA grads, including from top schools like NYU, Virginia, Texas, and USC.
Edit: Sorry, I blanked and didn't see all the responses after Page 1.
As an addendum, there are a couple small groups that do true consulting work and go head to head against McK and DC on a regular basis. It is true Transaction Services is a different group, though given the lack of M&A activity, they are moving towards more consulting assignments. I have had the experiences that terp is talking about as well, the work I did when I started with the firm wasn't truly consulting (as I was told I would be doing when I joined the firm), but the work I do now is more under the classical definition. Thus, it does exist and it is growing, but not the biggest part.