Well, I gave most of my detailed comments on the boards for the appropriate maps, so I will just list my ratings, in greatest-to-least order as a summary: These ratings will be double what my commentary gave, to put them on a 10-point scale, as requested:
CJC: 8.14
Imzogelmo: 7.72
MischaPetya: 7.3
Love for Fire: 8
Nethis:6.84
Scootaloo: 6.84
dcsy: 6.64
nightmare: 6.7
Shoelace: 6.56
Travster: 6.44
Bigjoe: 6
Pete and Wally: 6
T. McSwain: 5.72
Chris Miller: 5.3
Hero of Fire: 4.56
BtjCaraft: 4.48
Questwiard: DNC (level 5; got too frustrating to finish)
edit (7/21): I finished scootaloo's quest, and have placed it appropriately in my list.
edit (8/3): I finished T. Mcswain's quest, and have added it in appropriately.
edit (8/8): I finished Shoelace's quest, being the final one of the entries. List updated.