Man, that looks so outdated, and even for an outdated looking game it looks pretty ugly.
I guess this is what happens when you mostly ignored the GC hardware last gen. You're not well prepared for the hardware like other developers. I hope Capcom puts forth a better effort with Sengoku BASARA.
"Just wait man, it'll improve to late dreamcast quality."
The starting point here is what games loooed like 10 years ago. think about that. It's not like a bad looking Gamecube game, PS2 game, or even a dreamcast game. This is a poor/marginal looking playstation ONE game.
Improve? Setting the developers on fire could be the only improvment.
Simple reason? The game has no official (or unofficial for that matter) North American name, and Koei themselves instructed everyone to use that as a title. I don't think it's going to be "Samurai Warriors: Musou Wave".
No surprise that the graphics for this game sucks. Koei had little/no experience with the GameCube; even those who did are open to new abilities with Wii in relation to GC (the greater RAM has made some features a lot more feasable).
Koei aren't the best for graphics anyway, and I bet their main graphics artists and coders are tucked away doing Fatal Inertia.
Still, this might improve, but I won't expect wonders.
SMG proves that Wii can pull of some good stuff in the graphics department, and I'm sure that's not the last good eye candy we'll see on Wii. I think all will be fine.