I rode TOTW then Khyber two weeks ago when I was still in Whistler - then both parts of Babylon and then the black trail which connects roughly to Creekside. That was a lot of fun, BUT:
I managed to enjoy most parts of Babylon on my 26" Enduro, although some of it was quite steep. But does anyone actually RIDE the rock face with the climbing rope and the weird woodwork drop further down, which lets you land directly into a flattish bermed sharp corner?
I had to climb/scramble/stumble down these two sections - it was very, very dry and dusty though, too dry. So I guess a bit of rain and then some sun again might be ideal for these trails.
I really couldn´t figure out how these two sections work. I´d have great respect for every rider who rides Babylon COMPLETE!
I did enjoy Microclimate in the rain though, traction was pretty good. When I rode it again in super dry conditions it was almost harder, because of all the dust.
What I really loved as well was Comfortably Numb. I think that´d be a great trail for eager bike teenagers as well. You could take the shortcut. And LOTS of clifbars and water :D