I love my replays too but PCars is a big letdown in this regard. Stuttering, skipping, pop up, car wheels visibly changing from 2D to 3D and back again, no physical gear changing in cockpit view in some cars, gear change indicator not changing in cockpit view in some cars, competitor cars badly stuttering when near the players car, when pausing the picture will skip forward a frame or three and back again when unpausing.
I'll stop there but it's a veritable laundry list of problems with the replays and the worst I have witnessed in any racing game ever.