I downloaded and played Case Zero a bit earlier... and wow, this is a rather substantial downgrade from from the original Dead Rising in terms of visuals, especially considering it's been four years since the first one came out.
It really lacks a whole ton of polish... Tons of texture pop-in, weird graphical glitches, very low framerate, awful, ugly shadows. The textures are super low-res as well. While I was downloading Case Zero I played the first game, and it's crazy how much much better it looks than DR2.
I love the first game, but I remained cautiously optimistic about Dead Rising 2. It's really too bad they had to switch engines, because this new one they are using sucks pretty bad. I was planning on picking it up on Steam... but I dunno. Is there any footage anywhere of the PC version?