I always preferred the zombies in Dead Rising than any other zombie game. Only because they typified what zombies should be like. Slow and dumb. It didn't actually make the game any easier and there's no doubt that Dead Rising 2 will be just as hard...
I just find it hard to believe zombies could ever ride motorbikes (as in Resident Evil 5) or even wear Nazi uniforms (as in Call of Duty World at War). Zombies came about from the 1968 film Night Of The Living Dead, so to put them in World War II doesn't make sense. One might argue it doesn't matter when they came about, as they don't exist. Yeah , they do. They are going to take over the world in 2012 and then well see if they are actually slow and dumb.