I've had a few pies here now, and I appreciate what they're trying to do, but I've been underwhelmed every time. My biggest issue is with the crust. Crust should be a beautiful, flaky, slightly salty base that provides some contrast and structure to the filling. Pie Hole/Mamma's crust is just extraordinarily bland.
Several of my friends have said much the same (and a few of the other commenters here) and I think that it really holds things back. The fillings are perfectly respectable and sometimes even quite good, but the crust is just nothing to write home about and it really dings the overall experience for me.