I feel like I'm one of the few people that played Spore and never heard the hype. I never saw the GDC stuff, I never heard about what people expected it to be, I got what I expected to get. And I honestly enjoyed it. It was shallow, yes, but to younger me it was a gold-mine, half the fun was creating weird creatures, even if they didn't have an effect on gameplay. If the creature stage was the entire game, but expanded and refined, I would've been far happier. But I'm just saying, people were hard on this game because it didn't live up to the hype, to what they expected/hoped it would be, for people who got what they expected it was a huge success, and a fun thing to sink some time in for a while, experimenting with stuff and checking out the weirdly expansive space stage.
Honestly, the space stage had a shit ton going on with it, and had more content in it than the other stages combined, it's where the meat of the game lies, but many people didn't get there because they got sick of it by the tribal stage or the civilization stage. It's sad, I agree with Shamus, this game just needed a proper sequel to make it better, to iterate on these systems.
RIP in Peace Spore