Average ratings are based on the published values and not the values entered in your own log entries.
5b is the best overall overlook (several actually) and is very accessible (a short 1.5 mile round trip hike via 6 from the parking area).
4b offers a few scenic overlooks with unending views toward the horizon.
Not that impressed with 4a.
Trails 3, 4, and 5 are fairly rocky. A lot of sun with some intermittent shade. 2a is much shadier and wooded, although the creek was dry during our hike.