Firstly, this campaign only has one scenario, not 3. Perhaps the author forgot to add the other two to the campaign, I don't know.
Playability: 2
As most campaigns do, often only by luck, this campaign does offer a little playability. This is put off by the fact there is too much imbalance. For some, you may enjoy it, if you prefer more professional campaigns you won't. You basically just explore the map and kill the weak enemies.
Balance: 1
You have 99999 of every resource. This is sort of a "trademark" of a newbic campaign. In summary, if you can build a dock and run around some animals you can win, because it has the "Full tech tree 99999 and crap enemies" routine. The opponents are just villagers and a TC really, since the map around them is blank. I don't even think they have been given any resources.
Creativity: 2
A little creativity in use of Gaia animals as irritants, but that's all they really were. The map itself was creative, but easily explored by the Black Riders.
Map Design: 2
The map was very big, with a lot of terrain brush and no eye candy. It didn't really enhance the challenge, just made it a little longer. Try designing on a smaller map. Good to see a bunch of Gaia trees, that's a start.
Story/Instructions: 1
Nothing here at all. The tribes didn't have names either. A bit slack when it comes to presentation overall.
Advice:
A 1.6 is an average start, just read the tutorials in the Siege Workshop and study how other authors make campaigns by playing some of the "Best of" (Top rated) and your ratings will double easily. If you want some help, drop by the forums. Don't forget to update the other two scenarios to the campaign, and I'll give some feedback on those.