Yes, do a review of your own! No point arguing with Stan. And if we all gave it what we thought it deserved, then the average review score 9the one that counts) would reflect general preferences more. I mean, different reviewers like different things. A scenario can only incorporate so many of them. So some people like it a little, some like it a lot. If you want to voice your opininon, then review the map.
Also, now the average score is 4.8, which is pretty much what I'd give it (or maybe a 4.9 though). I would review it like this:
Playability: 4.8 (captivating, but I feel no need to replay; would've been better had there been some choices to make)
Creativity: 5 (some very creative trigger tricks, terrain, etc; nice map copy tricks too)
Balance: 4.8 (it's OK, but a bit on the easy side; my town was never under serious trouble, and I never really lost a building; however, lack of walls and towers, as well as limited wood and gold, makes it pretty interesting)
Map Design: 4.8 (very very nice, except for the grassy side, but you can't make the *whole* map good anyway; however, some things didn't look viking enough; I dislike maps that don't really give an atmosphere, but all the eyecandy sort of makes up, so I give this 4.8)
Story/Instructions: 4.8 (great instructions, but the story is kinda wierd; would've been better if Gyda got mad or something when an enemy was killed, or if there were some sort of side quests, sucha s giving her a present instead of having to destroy some enemy)
Overall: 4.84 (great work Ingo, almost a 4.9, but some areas could've been improved)
I'm not sure if you can give fractional scores, but I find the 1-2-3-4-5 scale kinda limited, and no category here was truly imperfect, but instead they each had one little thing lacking.
Anyway, this is my own opinion, and I don't do reviews so I won't review GC. However, if you feel strongly about this, review yourself!