There are some cracking bits on the red, but for me it always feels a bit cobbled together. As DBW said, short climb, trundle along the top for a bit, short descent. They never seem to make the most of the gradient apart from a couple of sections (the last bit of the red to the VC is pretty ace, for example).
The old black / unmarked stuff is ace on the whole, and I suspect there’s a load of it I haven’t found yet.
If you fancy a shorter route than the whole red, following the blue up and round from the VC until it joins with the red, then following that back isn’t a bad idea. You can also loop off from Dixon’s Hollow and take in a fair few bits of the WC course and off piste bits, then use fireroads to get back.