To be honest they bore me. Chopping down waves of mindless grunts with the swing of a sword is not fun for me. After an hour or so Dynasty Warriors became old.
I'll take a hack and slash game like Ninja Gaiden, Devil May Cry or God of War any day. I prefer fewer enemies that are harder to kill (health) and present a greater challenge (AI wise). But to each his own. I can see why some people like those games, it's just not for me.
Playstation = The Beast from the East
Sony + Nintendo = WIN! PS3 + PSV + PS4 + Wii U + 3DS