Yeah, I really think the different strategies are about as well balanced as they've ever been. They've just got situational advantages that really can't be accounted for in the ruleset.

On Topic Edit: And I really don't see what you're trying to say here Twist. Encouraging Rainbows would just reinforce bad playing, the whole game is built around the idea of specializing your economy to maximize output, and Oil/Farmer is already a viable strategy under the right conditions.