Why is Spore Creatures selling so poorly?

Where is the love for Spore Creatures for the DS?  Granted I haven’t picked up a copy myself, I had planned to.  But many, many reviews are lashing at it giving the game poor ratings.  I still want to grab the game, but with all of the bad press it has been getting, it’s bound to end up in the bargin bins soon…And I love saving money!

Official Nintendo Magazine