IMO the order would be Blue, then Sprain, then Graham, but that's just
my preference.
I concur that it is probably not worth the drive from Morristown. But, if you are passing through or in the area, hit it. There is a map on Maprika but its missing several trails. Compare it to the one on the
www.wmba.org and you will see what I mean. It's not that hard to navigate though. Take this map:
http://wmba.org/wp-content/uploads/2010/05/Graham-Hills.pdf
Graham Hills is basically a small mountain wedged between a couple highways. A lot has been packed into a small amount of acreage. You could definitely spend a few hours checking out the whole place.
There are a couple trails down in the flatter sections (pink and outer blue loop). But, if you take a look at the trail map topography you will see that you will likely climb that hill more than once to make a decent loop of it. But, some of the trails that switchback make the climb up more bearable (i.e. updraft and tumbleweed). They also happen to be fun going down. Marker 9 on the map is basically the top of the hill. Get there, select a downhill and enjoy! Plenty of rocks and tech to be had too.