For the most part, as people have been saying, GoW updated the graphics. While Metroid Prime Trilogy upgated the graphics, updated the gameplay and has 3 games on one disk.
So what do you deem more worthy of a higher score? Graphics or gameplay? Or does it come down to an HD system vs the Wii? Either way, it seems that reviewers have been downscoring Wii games for something.
I agree, the person who started this thread didn't present his argument well (kind of condescendingly), but the facts remain. Reviewers are downscoring Wii games.