After six games of Runewars I have learned a few things...
1) Your heros will be coerced to join the enemy at the worst possible moment. My group now believes that Mad Carthos is the most powerful figure in Terrinoth. In two seperate games his switching sides determined the winner. In both games he switched from the Evil to the Good side
2) Collecting influence is rarely a bad idea. Particularly in the seasons leading up to winter. Most of the Winter season cards are responsible for a hero gaining a dragon rune.
3) Location, Location, Location. Starting locations are very important to determining the course of the game. Food is particularly important for the Elves, lest your armies starve in the winter. Having all the ore in the world will not feed your armies. While having a bunch of dragons and giants nearby may seen as a nice deterent from enemy attack and may seem like an opportunity to gain a powerful ally, it is more likely a thorn in your side.
4) Heros, while not essential to victory, can certainly help your cause and enemy heroes questing unchallenged may spell their victory.
What have you all learned from playing Runewars?
)