That top game isn't impressive at all, it looks dull and bland. The bottom one, Muramasa, looks vastly superior.
Graphics = visuals, not just tech. Great tech is irrelevant if the end product doesn't look good. Metroid Prime 3 looks better than most 360 games, hence it is more impressive.
Actually it is literally 100 times more impressive thn Muramasa in just about every possible technical aspect. Polygons, animations, lighting, textures, shaders, literally everything. Your bias is extremly strong in this one.
Graphics are strictily about visual technical aspects of the game. What you are referring to are aesthetics, which are subjective, pointless to debate about, and are not what this thread is about.