I quite like TNF trail myself – not something for all the time, but it's a good easy option for just getting out there every now and again! Especially if the weather is a bit pants (but then it is only 15 minutes from the house to get there!)
Not been riding much of late though, and not since moving to the Lakes… and haven't yet done the Parkamoor descent. Really need to get my arse in gear!
But no – I wouldn't drive over from Leeds to do it. If you had a plan of a ride, got here and it was pissing it down then it makes a reasonable back up option (not tried Whinlatter yet myself either!).
Favourite descent in the Lakes is Ironkeld still, but that was just a perfect days ride several years ago now. Good company, good beer, good weather… aaaaah, halcyon days I tells thee.