To be fair, this is a console with a much-maligned line-up going up against possibly the best Nintendo home console (YMMV). But another problem in my eyes is that a lot of the best Wii games were new franchises, or at least lacked a GC predecessor. Looking at the Wii voting thread, of the top ten, Xenoblade, Okami, Wii Sports and Monster Hunter Tri had no GC ancestor; Rhythm Paradise and Muramasa from my personal top ten fall under the same boat.
Coming into it afresh, Metroid Prime Trilogy is objectively better than any of the GC Metroid games, because you're getting both and another game!