From my limited experience, MPC-HC did show frame rate irregularities. But WMC7 using the 4-1-1-ctrl-d was more specific. For me it displayed 59.401 but when a stutter occurred it jumped to 29.97 at exactly that point in time. This was with some OTA SD recordings.
That being said, I never saw the stuttering with MPC-HC. And I don't recall playing the same recordings with WMPlayer. But it was obvious when using WMC7.
I just installed an inexpensive HD 6450 video card with its latest drivers & that took care of the problem. Of course YMMV.