In the same interview in which Nintendo’s Godfather of Gaming, Shigeru Miyamoto, spoke in vague terms about an HD Wii, he also spoke about some other topics; among those he tackled was the notion that the Wii isn’t meeting the graphical standard which hardcore gamers are looking for:
“… When it comes to specific points such as generating high definition graphics we might appear to be rather relaxed and soft on graphics,” he acknowledged.
“However, the fact of the matter is that Wii is capable enough to cater to the needs of these hardcore gamers in terms of gameplay content as well as the graphical content, so I really don’t want people to be concerned about that kind of attitude.” — Shigeru Miyamoto to 3sat, via CVG
Personally speaking, I think the graphics the Wii are capable of is just fine, though I think there are some developers that don’t push it as far as it can go. HD may add yet more to it, but the likes of Super Mario Galaxy, Super Smash Bros. Brawl, Mario Kart Wii, Metroid Prime 3, and even The Legend of Zelda: Twilight Princess all look great to me.