Sounds like Lewis did 2 rides exactly opposite to me.
A couple of weeks ago I did Burma road, up from Carbridge then down the singletrack from the top.
Yes it was a bit rocky and interesting and some was slow, but beyond the top bit it was a blast.
Next day was CBM, up the river to the old bridge, up the landy track to the top. Once there a little diversion to bag the 2 munros (one south which is boring, the Northern one good with an amazing view) then down the CBM singletrack. One of the best descents around.

Munto 2 by ChrisWilkinson1, on Flickr
I'm lucky enough to be heading up there again on Friday.
Day one Braemar, Glen Tilt, Blari Atholl, Gaick pass to Kingussie. Day 2 Feshie, Rothiemurcus, Ryovan, Abernethy to Tomintoul. Day 3 just back to Braemar (and driving to Liverpool for some).