Comment I liken it to playing with Legos (Score 1) 279
To me it's like playing with cube-shaped Lego bricks in that the satisfaction comes from thinking of, planning, and building cool-looking stuff on an infinitely large green baseplate. Also like playing with Legos, sometimes you have to hunt through the pile to find that one block you need to make your tower go from cool to extra cool. And to take it a bit further, sometimes at night your little green brother who is totally annoying will come over and blow up the fishing cabin you were working on for the last 15 minutes.
(Or to take another tack, if you liked building cars and creatures more than playing the actual game in Spore you'd probably enjoy Minecraft.)