Neocrisis: Dynasty Warriors is one of those games that for some reason, just wouldn't be DW if the formula was drastically changed. In your mind, you might believe or say, "duh, you believe that because there's been seven iterations of it, not even counting the Romance of the Three Kingdoms games."
I digress, Koei got lucky, found a game that worked, and now presents a yearly or biannually, a new game that looks relatively the same. However it comes with a new coat of paint - all the while removing, let's say a sick stereo system for a better radiator. Terrible metaphor, but you get it: they did this when they presented us DW 5 after an amazing DW 4.