That Spore has been one of the most interesting games is proven by the enthousiasm of those who previewed it, but also the awards it's already getting. The official "Best of E3" nominees aren't announced yet, but 1Up has, among others, already announced Spore to be the best PC game of the E3. Compared to previous previews, theirs is fairly short. They say Will Wright calls the game a "Massively Single-Player" game, to explain that although other player's creatures enter your game, you cannot directly affect their game. Just the local copy on your computer, of their game. Comparing it to the Sims, it's like Sims from other players are constantly being added to the neighborhood for you to interact with. Read the preview for the exact words of the writer whose opinion it is that Spore was the game of the show this E3.