The crew behind the site FileFront was able to check out DarkSpore from the PAX 2010 event and brought back their impressions:
The little time I spent with Darkspore was fun, and I’m eager to see how creature customization plays into the experience in the long run.
My one concern was that Darkspore did not pack any real challenge at all. I pretty much walked through the level, just clicking abilities and firing them off at will. I was told that the reason for this was, well, because it’s a floor demo and they wanted it to be easy. Fair enough.
I was then told that when you’re presented with a new planet, you have to strategically make some tough choices and pick the strongest team possible, based on your available creatures. That’s where some of the challenge kicks in. Also, as you progress further into the game, the difficulty ramps way up.
full impressions here (with gameplay video)