Okay.....so if you're calling it gnarly......just how impossible is it?!?!
Vedder is indeed a popular & excellent riding area. Different from Church/Tamahi; different from Chipmunk.
My experience is that the individual trails are longer at Vedder. So if I'm struggling / having a tough time, I know I'll be stuck with it for several minutes. An equally challenging experience at Church will 'release me' to a FSR much sooner.
Vedder has alot of trail users compared to Church. Decent cooperation among cyclists, hikers, equestrian, ATV & dirtbikes... but still busy with a bit of conflict. Church has very few non-motorized users, and the trails are less well known (because we're the ones that opened / maintain them).
Chipmunk is another story altogether... those GVMC-maintained trails always hand me my ass.
The Church/Tamihi trails are more conducive to dualsporting, offering trails that 'flow', decent loops and through-routes utilizing FSRs. Since we lead major events there at least 2x yearly, we're guilty of spending most of our time there - maintaining, marking & opening trails.
Enjoy!