"Dead Rising: Chop Till You Drop is kinda like a sample of the true Dead Rising on the Xbox 360. Think of it like a demo."
Having fewer zombies is not the same as only having a few levels (or missions in this case). And it has content not even in the 360 version, so that analogy is false on two levels.
A flashy-first game is awesome when it comes out. A great-first game is awesome forever.
Plus, just for the hell of it: Kelly Brook at the 2008 BAFTAs