He plays in the same areas as a DM without doubt, I mean think about it, for almost 2 years he played cm in a midfield of Lennon, modric, hudd and bale. That's 2 out and out flying wingers, if hudd and modric don't hold their pos in a deep ish cm role then we get torn to shreds week in week out, not get 4th and then champs league quarter final!
Out of interest, who do you compare hudd to in terms of someone playing a similar position to him?
His defensive work is nowhere near as bad as you make out either, you need to think more carrack instead of Parker.