Wired published a review of Spore. It's not really a typical review, in this article they focus on 10 things you learn from the game:
9. The apple doesn't fall far from the tree.
Before you even begin the Cell stage, you have to make a decision: Is your little guy an herbivore or a carnivore? This can have lasting repercussions throughout the rest of the game. As a carnivore, the easiest way to get meat is to attack your fellow creatures. This turns your bacteria into kind of a jerk, and when he evolves, he'll be more suited to being an aggressive land animal. Establishing dominance with violence will be easier than trying to reason with other creatures. And if you take this path of least resistance throughout the rest of the game, you'll be a warlike spacefaring race of jerks in no time, just because your aquatic ancestors went on the Atkins diet eons ago.