I’ve taken pics of the event for the last 4 years, following the race for the whole week for the last 3.
The rain in ’08 was horrific, but amongst those who didn’t crack it did engender a kind of war mentality that made for a pretty interesting experience. And in all honesty the event barely coped with the strain on the logistics.
However, since then the organisers have prepared a lot better for the possibility of rain and if it did happen again I don’t think the experience would be half so “challenging”.
As it happens though, for the last two years the weather has generally been pretty good so it has been slightly less of a test of mental toughness.
I suspect that with a few enduros under your belt, and so long as you put in a few long rides in the run up that you would be fine so long as you pace yourself from the start.
Here’s a slideshow from 2010