Why is this even an argument? even if they were the same models and all that, it's not like you could notice it on the blurry Wii version that dropped frames like a motherfucker. Unless whoever porting this is awful, it would at least have a consistent frame rate (60 or whatever) and the screens show that it's actually sharp and show off the models/textures properly. I'm sure if you played the Wii game on an emulator it could look closer to this, but that wouldn't be playing it on the Wii.
skimming through that thread on gaf, the major defending points are "waggle made the game" (a dumb statement), "NMH2 blah blah" (ignore that we're excited for CoD4 when MW2 is already out!) and "the models and textures on the Wii version are great...when you rip and look at them on the PC" (bravo!)
and I have no intention of buying this. The first game was enjoyable but that enjoyment was cut with boring open world segments. If NMH2 was coming out on 360/PS3 within a reasonable time around the Wii version, I'd get that instead. I already planned to play NMH2 with the CC Pro.