First, you really cant compare Sims/Sims 2 with Spore.
Sims was open-ended.. literally, it just kept on going. Spore had STAGES, where you go through.
That's quite a moot point. I was not comparing Sims gameplay to Spore gameplay. I was comparing how you treat the Sims to how you were "meant" to treat Spore. The Sims would quickly get boring if you didn't care about the behavior, relationships, and what-all of the Sims. It
is the same thing with Spore. If you don't care about how your race is supposed to behave, interact with other races, or create buildings, it'll get pretty old.
and secondly, use imagination to play a game? seriously? I'd rather read a book then.
Then you must read a ton of books and play no video games. Just about every video game requires some imagination - whether it's accepting that there's a super-advanced alien race taking over our galaxy or accepting a little plumber can do triple jumps, backflips, and fly around because his hat has a couple Hermes wings. It's a matter of how you perceive the game that makes it fun.