This latest Dynasty Warriors 6, Dynasty Warriors 6 Special, won't require users to install data to the Memory Stick, but will have benefits for those who do. If you install the 260MB data, the speech in the game will be voiced. If you don't, your allies and enemies on the battlefield will communicate via text windows.
Actually, now that we think about it, not having a thousand dudes yelling at you all the time seems a lot better. Thanks for the option, Koei!