This is a brilliant expansion to a poor base game. EA/Maxi definitly made the right choice in delaying this for 6 months, the results show. Solves a lot of problems from the original Spore. It makes the Space stage less repetitive. Spore big plus was its creative features and this expansion allows you to test your creations. For me the big problem with the creativity of Spore.
You can now create your own adventures! If you like creativity and developing your own stories this is a must. The tools are very intuitive to the point where you can develop a complex war scene in a couple of days. I made the Clone wars attack scene from Star Wars II in less then a week, and it looked good.
Creativity in video games needs to go in this direction