I admit most Wii games look like PS2 games and the biggest reason of this is because most of those games are cheap cash ins. I believe capcom will do a good job graphically with MH3.
Some pics for those who think that the Wii graphics are PS2 level graphics(all of them are in game):
PS Vita and PC gamer
CPU Intel i5 2500K at 4.5 Ghz / Gigabyte Z68 Mobo / 8 Gb Corsair Vengeance 1600 mhz / Sapphire HD 7970 Dual X Boost / Corsair Obsidian 550d