I'm going to just say graphics of the second game. I heard nothing about the first game but after the second was released it exploded.
I say graphics because to me that's the only thing the second game has over the first and the second is almost always considered better. Also base my claim on all the current complaints, they're all about graphics being downgraded. Rarely do I read any talk about gameplay, story, or anything but graphics. They define the Witcher series.
