Is Dead Rising 2 worth it if I already have Off the Record?
It's the same game. If you're a completionist and you want to see Chuck's story, yes.
It's virtually the same game, with a model swapped (Chuck for Frank). OTR is the more complete game, as it has one extra area and one extra mode.
I'm going to pass it for now, as I don't believe 7,50 is a good price for it when I already have OTR.