Playability: This scenario was pretty fun to play, and had some interesting choices for the player to ponder. Except for a major bug that doesn't let you finish the game, and a minor bug not really worth mentioning, this scenario was very playable and fun.
Balance: Because the units you start out with have doubled health and attack, it is easy to mow down the enemy and basically demolish even the strongest computer with only minor damage done to your troops. Although the game probably wouldn't be winnable without the supercharged units, the enemy towns could have been a little better protected.
Creativity: This scenario isn't very creative when it comes to core gameplay, but there are some nice perks that make this game interesting. While all you really have to do is destroy castles, you get a different bonuses for destroying different players' castles. For instance, if you destroy a certain players castle, that computer player will then attack another computer player, making it easier for you to destroy the attacked players' castle.
Map design: The map was bland, looking basicly like a random map with some adjustments made to it. The lack of eye candy and differentiating terrain made this map boring.
Story/instructions: There is no story, and the instructions are sparse. There is only one object: to destroy each computer players' castle. When you actually destroy a few players' castles, the player's numbers aren't crossed off of the objectives list, making it a minor nuisance if you forget which castles you have destroyed.
Overall: While the game itself is fun to play, there could have been some cosmetic changes that would have definitely helped the score. My advice is to go over the scenario adding a few changes to: map design (adding more eye candy), balance (adding some better defenses or implementing the need for strategy), fixing the two bugs, and adding a nice story to complement the game.