Spore: Creatures is a fun game, with great graphics. However, it is very easy, and doesn't take long. The creature creator is quite fun to work with, and trying to earn all the badges can be fun. Earning enough points to be able to ‘buy’ cheats is great, as the cheats make everything a little more fun.
The only bad points about this game is that it is quite easy, even for the not so good gamers out there, and only having six worlds can get quite boring.
I would still recommend it, but if you are into hard games, stay away from this one.