Why would you want halo on wii? its got poor level design. I think Halo 3 was the pinnacle of the series poor level design. theres too many moments in halo where you go where am i suppose to go and/or what am i suppose to do. Halo decent design is in it's multiplayer ,but that even has huge flaws.
Grant it i play Halo online quite a bit ,but i see recognize that while its a good game its not the best.